README: Git for Windows is currently switching to the Git for Windows SDK

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

README.md

@@ -3,4 +3,9 @@
 This is the source code of [Git for Windows](http://msysgit.github.io/),
 forked from [Git](http://git-scm.com/).
 
+Please note that the Git for Windows project will soon switch to [another
+development environment](https://github.com/git-for-windows/) and that the
+upcoming Git for Windows 2.* will be maintained
+[here](https://github.com/git-for-windows/git).
+
 If you encounter problems, you can report them as [GitHub issues](https://github.com/msysgit/git/issues?direction=desc&sort=updated&state=open), discuss them on Git for Windows' [Google Group](http://groups.google.com/group/msysgit), and encourage others to work on by tipping via [![tip for next commit](http://tip4commit.com/projects/295.svg)](http://tip4commit.com/projects/295).