Update REAME.rst

- simplify a bit since we have the web site now. We don't use
  README.rst for index.html anymore.
- rewrite 'What's Ryu' section so that it can be used for RPM package
  description.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

README.rst

@@ -2,77 +2,51 @@
 Ryu Network Operating System
 ****************************
 
-For details, please see the documentation under doc/ directory and
-make html (or make <format you prefer>). If you have any
+What's Ryu
+==========
+Ryu is an Operating System for Software Defined Networking.
+            
+Ryu aims to provide a logically centralized control and well defined
+API that make it easy for operators to create new network management
+and control applications. Currently, Ryu manages network devices by
+using OpenFlow. You can say that Ryu is an OpenFlow Controller.
+
+All of the code is freely available under the Apache 2.0 license. Ryu
+is fully written in Python.
+
+
+Quick Start
+===========
+Installing Ryu is quite easy::
+
+   % pip install ryu
+
+If you prefer to install Ryu from the source code::
+
+   % git clone git://github.com/osrg/ryu.git
+   % cd ryu; python ./setup.py install
+
+If you want to use Ryu with `OpenStack <http://openstack.org/>`_,
+please refer `detailed documents <http://www.osrg.net/ryu/overview.html/>`_.
+You can create tens of thousands of isolated virtual networks without
+using VLAN.  The Ryu application is included in OpenStack mainline as
+of Essex release.
+
+If you want to run your Ryu application, Let's start with
+`a simple example
+ <https://github.com/osrg/ryu/blob/master/ryu/app/simple_switch.py>`_.
+Just type::
+
+   % ryu-manager yourapp.py
+
+
+Support
+=======
+Ryu Official site is `<http://osrg.github.com/ryu/>`_.
+
+If you have any
 questions, suggestions, and patches, the mailing list is available at
 `ryu-devel ML
 <https://lists.sourceforge.net/lists/listinfo/ryu-devel>`_.
 `The ML archive at Gmane <http://dir.gmane.org/gmane.network.ryu.devel>`_
 is also available.
-
-Ryu Official site is `<http://osrg.github.com/ryu/>`_.
-
-
-Overview
-========
-Ryu is an open-sourced Network Operating System (NOS) licensed under
-Apache v2.0. It's fully written in Python.
-
-Ryu aims to provide a logically centralized control and well defined
-API that make it easy for operators to create new network management
-and control applications. Currently, Ryu supports OpenFlow protocol to
-modify the behavior of network devices.
-
-We aim at the de facto OSS NOS implementation and NOS API.
-
-Currently, Ryu is shipped with one control application for `OpenStack
-<http://openstack.org/.>`_ network management L2 segregation of
-tenants without using VLAN. The application is included in OpenStack
-mainline as of Essex release.
-
-The project goal is to develop an OSS Network Operating System that
-has high quality enough for use in large production environment in
-code quality/functionality/usability.
-
-
-TODO
-====
-* OpenFlow Protocol version 1.2 (right after the spec release)
-* The better API for control applications
-* Cluster support
-* ...too many for here.
-
-
-Quick Start
-===========
-Get source code::
-
-   % git clone git://github.com/osrg/ryu.git
-
-Then just type::
-
-   % cd ryu; python ./setup.py install
-
-and run ryu-manager command which is installed.
-Then set up your openflow switch (hardware switch or OVS) to connect the ip
-address and port to which ryu-manager is listening.
-If you want to use it with Openstack (nova and quantum with ovs plugin),
-please refer detailed documents under doc/ directory.
-
-
-Requirement
-===========
-* setuptools
-* gevent >= 0.13
-* python-gflags
-* Sphinx
-* WebOb
-* Routes
-
-Project Members
-===============
-* OHMURA Kei <ohmura.kei at lab.ntt.co.jp>
-* MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
-* Isaku Yamahata <yamahata at valinux co jp>
-* FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> 
-