Add notices to the readme

Author: shana

README.md

@@ -1,6 +1,16 @@
 # GitHub Extension for Visual Studio
 
-**The location of the submodules has changed as of 31-01-2017.** If you have an existing clone, make sure to run `git submodule sync` to update your local clone with the new locations for the submodules.
+## Notices
+
+### VS 2017 v15.3 users, please read
+
+The Visual Studio 2017 15.3 installer [has a bug](https://github.com/github/VisualStudio/issues/1206) that causes a corruption of the installed extensions data when you revert an installation of the extension (see also [this MS issue](https://developercommunity.visualstudio.com/content/problem/102178/error-installing-github-extension.html)). Until VS 2017 15.4 comes out, a workaround for this is explained in [#1206](https://github.com/github/VisualStudio/issues/1206)
+
+### The location of the submodules has changed as of 31-01-2017
+
+If you have an existing clone, make sure to run `git submodule sync` to update your local clone with the new locations for the submodules.
+
+## About
 
 The GitHub Extension for Visual Studio provides GitHub integration in Visual Studio 2015.
 Most of the extension UI lives in the Team Explorer pane, which is available from the View menu.