Added a README for the demo app.

demoapp/README.rst

@@ -0,0 +1,35 @@
+Running demoapp
+===============
+
+Setup
+-----
+
+First, you need to create a virtual environment and switch to it::
+
+ $ pip install virtualenv
+ $ virtualenv .venv
+ $ . .venv/bin/activate
+
+Now, install the demo into the virtual environment::
+
+ $ python setup.py install
+
+Usage
+-----
+
+With cliff and the demo setup up, you can now play with it.
+
+Here are a list of the commands available::
+
+ XXX
+
+Here is some example usage::
+
+ XXX
+
+Cleaning Up
+-----------
+
+Finally, when done, deactivate your virtual environment::
+
+ $ deactivate