Update README

Author: Michael Davis

README.rst

@@ -23,6 +23,27 @@ This is a JOSE implementation that is fully compatible with Google App Engine
 which requires the use of the PyCrypto library.
 
 
+Installation
+------------
+
+::
+
+    $ pip install python-jose
+
+
+Usage
+-----
+
+.. code-block:: python
+
+    >>> from jose import jwt
+    >>> token = jwt.encode({'key': 'value'}, 'secret', algorithm='HS256')
+    u'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJrZXkiOiJ2YWx1ZSJ9.FG-8UppwHaFp1LgRYQQeS6EDQF7_6-bMFegNucHjmWg'
+
+    >>> jwt.decode(token, 'secret', algorithms=['HS256'])
+    {u'key': u'value'}
+
+
 Thanks
 ------