Adding mention of mailing list in project readme.

README.markdown

@@ -30,6 +30,8 @@ This framework is for you if:
 **[Get started using Lumberjack](https://github.com/robbiehanson/CocoaLumberjack/wiki/GettingStarted)**<br/>
 **[Learn more about Lumberjack](https://github.com/robbiehanson/CocoaLumberjack/wiki)**<br/>
 
+<br/>
+Can't find the answer to your question in any of the [wiki](https://github.com/robbiehanson/CocoaLumberjack/wiki) articles? Try the **[mailing list](http://groups.google.com/group/cocoalumberjack)**.
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