Add info about contrib repo to docs

rst/index.rst

@@ -88,6 +88,7 @@ you with questions about Ansible.
 * See the presentation on `Speakerdeck <http://speakerdeck.com/u/mpdehaan/p/ansible>`_
 * Visit the `Google Group <http://groups.google.com/group/ansible-project>`_
 * Chat on `FreeNode <http://webchat.freenode.net/?channels=ansible>`_
+* View or add to the the `Contrib Repo <https://github.com/ansible/ansible-contrib>`_ on Github
 
 .. raw:: html