Add a README file for some background information about this repo

Let's add some general information about this repository, links to
redmine, gerrit, the mailing list, etc.

Change-Id: If034c6f551ff9bfaff0b8368fd0963f3147155b9
diff --git a/Makefile.am b/Makefile.am
index e5639d3..6ef275f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,7 @@
 dist-hook:
 	echo $(VERSION) > $(distdir)/.tarball-version
 
-EXTRA_DIST = git-version-gen .version
+EXTRA_DIST = git-version-gen .version README.md
 
 if HAVE_DOXYGEN