Add some usage instructions to the README

README.rst

@@ -1,4 +1,67 @@
 bcrypt
 ======
 
+.. image:: https://travis-ci.org/dstufft/bcrypt.png?branch=master
+    :target: https://travis-ci.org/dstufft/bcrypt
+
 Modern password hashing for your software and your servers
+
+
+Installation
+============
+
+To install bcrypt, simply:
+
+.. code:: bash
+
+    $ pip install bcrypt
+
+
+Usage
+-----
+
+Basic
+~~~~~
+
+Hashing and then later checking that a password matches the previous hashed
+password is very simple:
+
+.. code:: pycon
+
+    >>> import bcrypt
+    >>> password = b"super secret password"
+    >>> # Hash a password for the first time, with a randomly-generated salt
+    >>> hashed = bcrypt.hashpw(password, bcrypt.gensalt())
+    >>> # Check that a unhashed password matches one that has previously been
+    >>> #   hashed
+    >>> if bcrypt.hashpw(password, hashed) == hashed:
+    ...     print("It Matches!")
+    ... else:
+    ...     print("It Does not Match :(")
+
+
+Adjustable Work Factor
+~~~~~~~~~~~~~~~~~~~~~~
+One of bcrypt's features is an adjustable logarithmic work factor. To adjust
+the work factor merely pass the desired number of rounds to
+``bcrypt.gensalt(rounds=12)`` which defaults to 12):
+
+.. code:: pycon
+
+    >>> import bcrypt
+    >>> password = b"super secret password"
+    >>> # Hash a password for the first time, with a certain number of rounds
+    >>> hashed = bcrypt.hashpw(password, bcrypt.gensalt(10))
+    >>> # Check that a unhashed password matches one that has previously been
+    >>> #   hashed
+    >>> if bcrypt.hashpw(password, hashed) == hashed:
+    ...     print("It Matches!")
+    ... else:
+    ...     print("It Does not Match :(")
+
+
+Compatibility
+-------------
+
+This library should be compatible with py-bcrypt and it will run on Python
+2.6, 2.7, 3.2, 3.3 and PyPy 2.0.