Add documentation link

oliverpool · oliverpool · commit 56183255e4f0 · 2016-06-09T15:34:45.000+02:00
diff --git a/README.md b/README.md
@@ -1,6 +1,8 @@
 Patadata
 ========
 
+[![documentation](http://readthedocs.org/projects/patacrep/badge)](http://patacrep.readthedocs.io)
+
 Songs data for LaTeX songbooks.
 
 This data is meant to be processed by the songbook toolkit:
