Improve readme contents

Add more information in README.rst
Add information link list as fallow:
* PyPi - package installation
* Online Documentation
* Launchpad
* Source

Change-Id: Ia4f61f01bf0f1b7fdbd05b1d7dc4e53d102774dd

README.rst

@@ -1,6 +1,14 @@
 Python bindings to the Magnum API
 =================================
 
+.. image:: https://img.shields.io/pypi/v/python-magnumclient.svg
+    :target: https://pypi.python.org/pypi/python-magnumclient/
+    :alt: Latest Version
+
+.. image:: https://img.shields.io/pypi/dm/python-magnumclient.svg
+    :target: https://pypi.python.org/pypi/python-magnumclient/
+    :alt: Downloads
+
 This is a client library for Magnum built on the Magnum API. It
 provides a Python API (the ``magnumclient`` module) and a command-line
 tool (``magnum``).
@@ -10,5 +18,14 @@ in the `developer guide
 <http://docs.openstack.org/infra/manual/developers.html>`_.
 
 * License: Apache License, Version 2.0
-* Source: http://git.openstack.org/cgit/openstack/python-magnumclient
-* Bugs: http://bugs.launchpad.net/python-magnumclient
+* `PyPi`_ - package installation
+* `Online Documentation`_
+* `Launchpad project`_ - release management
+* `Bugs`_ - issue tracking
+* `Source`_
+
+.. _PyPi: https://pypi.python.org/pypi/python-magnumclient
+.. _Online Documentation: http://docs.openstack.org/developer/python-magnumclient
+.. _Launchpad project: https://launchpad.net/python-magnumclient
+.. _Bugs: https://bugs.launchpad.net/python-magnumclient
+.. _Source: https://git.openstack.org/cgit/openstack/python-magnumclient