Add doumentation on how to use the testapp

Author: codingjoe

CONTRIBUTING.rst

@@ -19,3 +19,18 @@ To build the documentation run::
 
     python setup.py build_sphinx
     open docs/_build/html/index.html
+
+
+The sample app
+==============
+
+To run a full example — e.g. to debug frontend code – you can run::
+
+    python setup.py develop
+    python /tests/testapp/manage.py migrate
+    python /tests/testapp/manage.py createsuperuser
+    # You will be asked for the email address of your new superuser
+    python /tests/testapp/manage.py runserver
+
+Next you can go to https://localhost:8000/admin/ and log in with your newly
+created superuser.