Update CONTRIBUTING.markdown

Author: johnsheehan

CONTRIBUTING.markdown

@@ -1,8 +1,14 @@
 Follow these guidelines, in no particular order, to improve your chances of having a pull request merged in.
 
+### Before you do anything else
+
+ * Before reporting an issue or creating a pull request, discuss it in the Google Group http://groups.google.com/group/restsharp
+
+### Once a contribution is ready to be submitted
+
  * Make each pull request atomic and exclusive; don't send pull requests for a laundry list of changes.
  * Even better, commit in small manageable chunks.
- * Tabs, not spaces. Bracket style doesn't matter.
+ * Tabs, not spaces. Bracket style doesn't matter. Do not reformat code you didn't touch.
  * Changes to XmlDeserializer or JsonDeserializer must be accompanied by a unit test covering the change.
  * No regions except for license header
  * Code must build for .NET 3.5 Client Profile, Silverlight 4 and Windows Phone 7