[Docs] google groups

Resources/doc/index.rst

@@ -8,6 +8,11 @@ Doctrine ORM Admin's documentation!
 
 The ``Doctrine ORM Admin`` provides services to work with the ``Admin Bundle`` and the ``Doctrine Project``.
 
+**Google Groups**: For questions and proposals you can post on this google groups
+
+* [Sonata Users](https://groups.google.com/group/sonata-users): Only for user questions
+* [Sonata Devs](https://groups.google.com/group/sonata-devs): Only for devs
+
 Reference Guide
 ---------------