add README.md (on how to maintain source tree imports and branches).

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+This is a partial import of rx.codeplex.com for mono.
+
+Since rx.codeplex.com is massive and we only need partial source tree of it
+(and due to some checkout failure on Linux [*1]), we set up another
+repository for mono submodule.
+
+This tree is hence manually imported. Though it is somewhat easy to maintain:
+we can cherry-pick changes only in Rx.NET in the rx.codeplex.com.
+Mostly we would not need to copy sources from the original treemanually,
+but sometimes we do when a checkout involves other directories than Rx.NET.
+
+For every original release, we should import the updates and commit to
+this master, then create a branch for each release and *then* apply our
+local changes (which is minimum but required) to the branch.
+
+[*1] http://codeplex.codeplex.com/workitem/26133