upd readme and add coveralls bage

README.rst

@@ -2,6 +2,17 @@ aiogearman (work in progress)
 =============================
 .. image:: https://travis-ci.org/jettify/aiogearman.svg?branch=master
     :target: https://travis-ci.org/jettify/aiogearman
+.. image:: https://coveralls.io/repos/jettify/aiogearman/badge.svg
+    :target: https://coveralls.io/r/jettify/aiogearman
+
+
+*aiogearman* -- is a library for accessing a gearman_ job server from
+the asyncio (PEP-3156/tulip) framework.
+
+gearman_ provides a generic application framework to farm out work to
+other machines or processes that are better suited to do the work. It
+allows you to do work in parallel, to load balance processing, and to
+call functions between languages.
 
 
 Requirements
@@ -18,3 +29,4 @@ The *aiogearman* is offered under MIT license.
 
 .. _Python: https://www.python.org
 .. _asyncio: http://docs.python.org/3.4/library/asyncio.html
+.. _gearman: http://gearman.org/