Add Roslyn version 3.5.0-beta2-20074-05 binaries from the (#26)

.. nuget `Microsoft.Net.Compilers.Toolset`.

Version taken from msbuild/mono-2019-10 branch,
(https://github.com/mono/msbuild/blob/mono-2019-10/eng/Versions.props#L27).

- Skipped from the nuget:
	- [Content_Types].xml
	- catalog.json
	- extension.vsixmanifest
	- manifest.json
	- Roslyn.Compilers.Extension.* (windows/VS specific)
	- skipped package/* directory

- Edited `csi.rsp` with (matches what we used for 3.4.0):

```
-/r:System
-/r:System.Core
-/r:Microsoft.CSharp
+/r:System.dll
+/r:System.Core.dll
+/r:Microsoft.CSharp.dll
+/r:Facades/System.Runtime.dll
+/r:Facades/netstandard.dll
/u:System
/u:System.IO
/u:System.Collections.Generic
```

20 files changed, 10 insertions, 13 deletions

diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.Build.Tasks.CodeAnalysis.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.Build.Tasks.CodeAnalysis.dll
index 28b6b33..f2d4647 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.Build.Tasks.CodeAnalysis.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.Build.Tasks.CodeAnalysis.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CSharp.Core.targets b/Microsoft.Net.Compilers/3.5.0/Microsoft.CSharp.Core.targets
index 7db6883..ed91b90 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CSharp.Core.targets
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CSharp.Core.targets
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="Microsoft.Managed.Core.targets"/>
 
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.Scripting.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.Scripting.dll
index 7789a5d..fc7246e 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.Scripting.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.Scripting.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.dll
index 51bb8de..511a896 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.CSharp.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.Scripting.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.Scripting.dll
index ef549d5..e5f02c5 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.Scripting.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.Scripting.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.VisualBasic.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.VisualBasic.dll
index aa3b3e6..dc155c6 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.VisualBasic.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.VisualBasic.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.dll b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.dll
index 15ded97..c044e10 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.dll
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.CodeAnalysis.dll
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.Managed.Core.targets b/Microsoft.Net.Compilers/3.5.0/Microsoft.Managed.Core.targets
index a6c9a14..c87a659 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.Managed.Core.targets
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.Managed.Core.targets
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <!--
     Common targets for managed compilers.
diff --git a/Microsoft.Net.Compilers/3.5.0/Microsoft.VisualBasic.Core.targets b/Microsoft.Net.Compilers/3.5.0/Microsoft.VisualBasic.Core.targets
index e69d6c8..d9e5eaa 100644
--- a/Microsoft.Net.Compilers/3.5.0/Microsoft.VisualBasic.Core.targets
+++ b/Microsoft.Net.Compilers/3.5.0/Microsoft.VisualBasic.Core.targets
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="Microsoft.Managed.Core.targets"/>
 
diff --git a/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe b/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe
index f52deae..643b2f7 100644
--- a/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe
+++ b/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe
diff --git a/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe.config b/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe.config
index 47ae91f..148abe6 100644
--- a/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe.config
+++ b/Microsoft.Net.Compilers/3.5.0/VBCSCompiler.exe.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <configuration>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
diff --git a/Microsoft.Net.Compilers/3.5.0/csc.exe b/Microsoft.Net.Compilers/3.5.0/csc.exe
index 6d5557b..0ad328e 100644
--- a/Microsoft.Net.Compilers/3.5.0/csc.exe
+++ b/Microsoft.Net.Compilers/3.5.0/csc.exe
diff --git a/Microsoft.Net.Compilers/3.5.0/csc.exe.config b/Microsoft.Net.Compilers/3.5.0/csc.exe.config
index c7d3dee..9f958fb 100644
--- a/Microsoft.Net.Compilers/3.5.0/csc.exe.config
+++ b/Microsoft.Net.Compilers/3.5.0/csc.exe.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <configuration>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
diff --git a/Microsoft.Net.Compilers/3.5.0/csc.rsp b/Microsoft.Net.Compilers/3.5.0/csc.rsp
index 7b1e629..ce72ac6 100644
--- a/Microsoft.Net.Compilers/3.5.0/csc.rsp
+++ b/Microsoft.Net.Compilers/3.5.0/csc.rsp
@@ -1,6 +1,4 @@
-# Licensed to the .NET Foundation under one or more agreements.
-# The .NET Foundation licenses this file to you under the MIT license.
-# See the LICENSE file in the project root for more information.
+# Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
 # This file contains command-line options that the C#
 # command line compiler (CSC) will process as part
diff --git a/Microsoft.Net.Compilers/3.5.0/csi.exe b/Microsoft.Net.Compilers/3.5.0/csi.exe
index 5b60800..7154f7f 100644
--- a/Microsoft.Net.Compilers/3.5.0/csi.exe
+++ b/Microsoft.Net.Compilers/3.5.0/csi.exe
diff --git a/Microsoft.Net.Compilers/3.5.0/csi.exe.config b/Microsoft.Net.Compilers/3.5.0/csi.exe.config
index e994c0b..f228a3b 100644
--- a/Microsoft.Net.Compilers/3.5.0/csi.exe.config
+++ b/Microsoft.Net.Compilers/3.5.0/csi.exe.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <configuration>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
diff --git a/Microsoft.Net.Compilers/3.5.0/vbc.exe b/Microsoft.Net.Compilers/3.5.0/vbc.exe
index 5dfc14a..8134eae 100644
--- a/Microsoft.Net.Compilers/3.5.0/vbc.exe
+++ b/Microsoft.Net.Compilers/3.5.0/vbc.exe
diff --git a/Microsoft.Net.Compilers/3.5.0/vbc.exe.config b/Microsoft.Net.Compilers/3.5.0/vbc.exe.config
index 17bd665..fbac85c 100644
--- a/Microsoft.Net.Compilers/3.5.0/vbc.exe.config
+++ b/Microsoft.Net.Compilers/3.5.0/vbc.exe.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <configuration>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
diff --git a/Microsoft.Net.Compilers/3.5.0/vbc.rsp b/Microsoft.Net.Compilers/3.5.0/vbc.rsp
index 794335a..473404d 100644
--- a/Microsoft.Net.Compilers/3.5.0/vbc.rsp
+++ b/Microsoft.Net.Compilers/3.5.0/vbc.rsp
@@ -1,6 +1,4 @@
-# Licensed to the .NET Foundation under one or more agreements.
-# The .NET Foundation licenses this file to you under the MIT license.
-# See the LICENSE file in the project root for more information.
+# Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
 # This file contains command-line options that the VB
 # command line compiler (VBC) will process as part
diff --git a/Microsoft.Net.Compilers/3.5.0/version.txt b/Microsoft.Net.Compilers/3.5.0/version.txt
new file mode 100644
index 0000000..ce96cca
--- /dev/null
+++ b/Microsoft.Net.Compilers/3.5.0/version.txt
@@ -0,0 +1 @@
+3.5.0-beta2-20074-05