DOC Update readme

- link to coverage and travis
- usage and installation instructions

Author: hayd

README.rst

@@ -1 +1,30 @@
-Extracting pandas.io files so they're available to multiple version of pandas.
+===== 
+pandas-datareader
+===== 
+
+Up to date remote data access for pandas, works for multiple versions of pandas.
+
+.. image:: https://travis-ci.org/pydata/pandas-datareader.svg?branch=master
+    :target: https://travis-ci.org/pydata/pandas-datareader
+
+.. image:: https://coveralls.io/repos/pydata/pandas-datareader/badge.svg
+    :target: https://coveralls.io/r/pydata/pandas-datareader
+
+Installation
+------------
+
+Install via pip
+
+.. code-block:: shell
+
+   $ pip install pandas-datareader
+
+Usage 
+--------
+
+Rather than import from ``pandas.io`` you should import from ``pandas-datareader``:
+
+.. code-block:: python
+
+   from pandas.io import data, wb  # becomes
+   from pandas_datareader import data, wb