Added documentation.

README.rst

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+GQL
+===
+
+This is a GraphQL client for Python. Plays nicely with ``graphene``,
+``graphql-core``, ``graphql-js`` and any other GraphQL implementation
+compatible with the spec.
+
+GQL architecture is inspired by ``React-Relay`` and ``Apollo-Client``.
+
+|travis| |pypi| |coveralls|
+
+Installation
+------------
+
+::
+
+    $ pip install gql
+
+Usage
+-----
+
+The example below shows how you can execute queries against a local
+schema.
+
+.. code:: python
+
+    from gql import gql, Client
+
+    client = Client(schema=schema)
+    query = gql('''
+    {
+      hello
+    }
+    ''')
+
+    client.execute(query)
+
+License
+-------
+
+`MIT
+License <https://github.com/graphql-python/gql/blob/master/LICENSE>`__
+
+.. |travis| image:: https://img.shields.io/travis/graphql-python/gql.svg?style=flat
+   :target: https://travis-ci.org/graphql-python/gql
+.. |pypi| image:: https://img.shields.io/pypi/v/gql.svg?style=flat
+   :target: https://pypi.python.org/pypi/gql
+.. |coveralls| image:: https://coveralls.io/repos/graphql-python/gql/badge.svg?branch=master&service=github
+   :target: https://coveralls.io/github/graphql-python/gql?branch=master