add mailing list details

Author: stephenc

pom.xml

@@ -48,6 +48,16 @@
     </developer>
   </developers>
 
+  <mailingLists>
+    <mailingList>
+      <name>Zendesk Java Client User List</name>
+      <subscribe>[email protected]</subscribe>
+      <unsubscribe>[email protected]</unsubscribe>
+      <post>[email protected]</post>
+      <archive>https://groups.google.com/forum/#!forum/zendesk-java-client-users</archive>
+    </mailingList>
+  </mailingLists>
+
   <prerequisites>
     <maven>3.0.4</maven>
   </prerequisites>