Created README with info

One big readme with instructions. Most of them are pretty clear and straight forward anyway.

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+# nextcloud desktop client
+:computer: theme and build instructions for the nextcloud dekstop client
+
+Based on https://github.com/owncloud/client/blob/master/doc/building.rst
+
+## Getting repository ready
+
+Run:
+```bash
+git submodule update --init
+cd client
+git submodule update --init
+cd ...
+```
+
+## Building on Linux
+
+Run:
+
+```bash
+mkdir build-linux
+cd build-linux
+cmake -D OEM_THEME_DIR=`pwd`/../nextcloudtheme ../client
+make
+make install
+```
+
+## Building on OSX
+
+TODO
+
+## Building on Windows
+
+### Building the docker image
+
+The docker image contains the toolchain to build the windows binary.
+Build it:
+
+```bash
+docker build -t nextcloud-client-win32:<version> client/admin/win/docker/
+```
+
+### Building the binary
+
+```bash
+docker run -v "$PWD:/home/user/" nextcloud-client-win32:2.2.2 /home/user/win/build.sh $(id -u)
+```