Update README.rst

link to wagtaildemo and make t-shirt promise.

README.rst

@@ -2,6 +2,12 @@ Wagtail CMS
 ===========
 
 Wagtail is a Django content management system focused on flexibility and user experience. Find out more at `wagtail.io <http://wagtail.io/>`_
-or use the instructions at `torchbox.github.io/wagtail <http://torchbox.github.io/wagtail/>`_ to get started.
+and `torchbox.github.io/wagtail <http://torchbox.github.io/wagtail/>`_. 
 
-If you're a Python or Django developer, fork the repo and get stuck in! We're keen to foster a development community and we welcome all your pull requests.
+Getting started
+~~~~~~~~~~~~~~~
+To get you up and running quickly, we've provided a demonstration site with all the configuration in place, at `github.com/torchbox/wagtaildemo <https://github.com/torchbox/wagtaildemo/>`_; see the `README <https://github.com/torchbox/wagtaildemo/blob/master/README.md>`_ for installation instructions.
+
+Contributing
+~~~~~~~~~~~~
+If you're a Python or Django developer, fork the repo and get stuck in! Send us a useful pull request and we'll post you a `t-shirt <https://twitter.com/WagtailCMS/status/432166799464210432/photo/1>`_.