added demo link to docs

docs/index.rst

@@ -8,6 +8,14 b" It's similar to github or bitbucket, but"
 There's no default free access to RhodeCode You have to create an account in order
 to use the application. 
 
+**RhodeCode demo is available at**
+
+http://hg.python-works.com
+
+The default access is
+
+- username: demo
+- password: demo
 
 RhodeCode uses `Semantic Versioning <http://semver.org/>`_