Update README

Author: jvelilla

README

@@ -1,6 +1,7 @@
 Eiffel CJ is a library to work with  Collection+JSON - Hypermedia Type,  http://www.amundsen.com/media-types/collection/
 
-The current CJ implementation does not implement the [extensions][1] proposals.
+The current CJ implementation does not implement the [extensions][1] proposals,  
+The google group is here [discussion group][2]
 
 [1]: https://github.com/mamund/collection-json/tree/master/extensions "extensions"
-https://groups.google.com/forum/?fromgroups#!forum/collectionjson
+[2]: https://groups.google.com/forum/?fromgroups#!forum/collectionjson "discussion group"