Adding questions.vraptor.org website

vraptor-site/content/en/docs/how-to-contribute.html

@@ -6,7 +6,7 @@
 
 ##Joining our mailing list
 
-You can answer questions from other users in our <a href="http://groups.google.com/group/caelum-vraptor">user mailing list</a> or <a href="http://stackoverflow.com/questions/tagged/vraptor">Stackoverflow</a> under the tag `vraptor`.
+You can answer questions from other users in our <a href="http://groups.google.com/group/caelum-vraptor">user mailing list</a>, <a href="http://questions.vraptor.org/">VRaptor questions</a> or <a href="http://stackoverflow.com/questions/tagged/vraptor">Stackoverflow</a> under the tag `vraptor`.
 
 ##Collaborating with the documentation