Add install instructions to README

Closes #13

README.rst

@@ -34,6 +34,8 @@ First install this package to register it with SQLAlchemy (see ``setup.py``).
 Requirements
 ============
 
+Install using ``pip install pyhive``.
+
 - Python 2.7
 - For Presto: Just a Presto install
 - For Hive
@@ -42,6 +44,8 @@ Requirements
   - ``TCLIService`` (from Hive in ``/usr/lib/hive/lib/py``)
   - ``thrift_sasl`` (from `Cloudera <https://github.com/y-lan/python-hiveserver2/blob/master/src/cloudera/thrift_sasl.py>`_)
 
+There's also a `third party Conda package <https://binstar.org/blaze/pyhive>`_.
+
 Testing
 =======