add link to Gitter in "community" page

content/community.rst

@@ -57,9 +57,18 @@ bug reports, discussions, and announcements.  You can use it in various ways:
   the bottom of the page, (3) add the above list address under "CC".
 
 
-Development list
+Development chat
 ----------------
 
+The Kwant developer chat is accessible to the community via `Gitter <https://gitter.im/kwant-project/Lobby>`_.
+Come say hi if you would like to get involved with developing Kwant! For longer development discussions
+we prefer posting to the development mailing list. This is a place for technical discussions about changes
+to Kwant. For bug reports please use the kwant-discuss mailing list.
+
+
+Development mailing list
+------------------------
+
 Those who are interested the development of Kwant are invited to subscribe to
 the `kwant-devel <https://mailman-mail5.webfaction.com/listinfo/kwant-devel>`_
 mailing list.  This is the place for technical discussions about changes to