Add CONTRIBUTE.rst. For #4

CHANGES.rst

@@ -3,6 +3,6 @@ Changelog
 
 0.1 - Unreleased
 ----------------
-- Created [jcbrand]
+- Concieved and created [jcbrand]
 - Performance enhancements for rosters [ichim-david]
 - Add "Connecting to chat..." info [alecghica]

CONTRIBUTE.rst

+===========================
+Contributing to Converse.js
+===========================
+
+Contributions to Converse.js are very welcome. Please follow the usual github
+workflow. Create your own local fork of this repository, make your changes and
+then submit a pull request.
+
+Before submitting a pull request
+================================
+
+Add tests for your bugfix or feature
+------------------------------------
+
+- Please try to add a test for any bug fixed or feature added. We use Jasmine
+  for testing.
+
+Check that the tests run
+------------------------
+
+- Check that the Jasmine BDD tests complete sucessfully. Open test.html in your
+  browser, and the tests will run automatically.