Add a README.md

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

README.md

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+# Git for Windows
+
+This is the source code of [Git for Windows](http://msysgit.github.io/),
+forked from [Git](http://git-scm.com/).
+
+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).