add googlegroup

README.md

@@ -25,3 +25,10 @@ Connecting to the server from PeerJS
         // No API key requried when not using cloud server
         var peer = new Peer('someid', {host: 'localhost', port: 9000});
     </script>
+
+## Problems?
+
+Discuss PeerJS on our Google Group:
+https://groups.google.com/forum/?fromgroups#!forum/peerjs
+
+Please post any bugs as a Github issue.