Update README with CLA info.

Author: craigcitro

README.md

@@ -1,34 +1,41 @@
 This is python client library for Google's discovery based APIs.
 
-http://google.github.io/google-api-python-client
+[Full documentation](http://google.github.io/google-api-python-client)
 
 
 Installation
 ============
 
-To install, simply use pip or easy_install:
+To install, simply use `pip` or `easy_install`:
 
    $ pip install --upgrade google-api-python-client
 
    $ easy_install --upgrade google-api-python-client
 
-See the Developers Guide for more detailed instructions and documentation:
-
-  https://developers.google.com/api-client-library/python/start/get_started
-
+See the
+[Developers Guide](https://developers.google.com/api-client-library/python/start/get_started)
+for more detailed instructions and documentation.
 
 Third Party Libraries
 =====================
 
 These libraries will be installed when you install the client library:
 
-http://code.google.com/p/httplib2
-http://code.google.com/p/uri-templates
+* http://code.google.com/p/httplib2
+* http://code.google.com/p/uri-templates
 
 Depending on your version of Python, these libraries may also be installed:
 
-http://pypi.python.org/pypi/simplejson/
+* http://pypi.python.org/pypi/simplejson/
 
 For development you will also need:
 
-http://pythonpaste.org/webtest/
+* http://pythonpaste.org/webtest/
+
+Contributing
+============
+
+Please see the
+[contributing page](http://google.github.io/google-api-python-client/contributing.html)
+for more information. In particular, we love pull requests -- but please make
+sure to sign the contributor license agreement.