Added initial README.md

Author: lynxman

README.md

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+## Python Environment Manager
+
+Python client library for [Environment Manager](https://github.com/trainline/environment-manager)
+
+### tl;dr
+
+Normal use of the Client
+
+```
+em_session = EMApi('server', 'user', 'password')
+results = em_session.get_upstreams_config()
+```
+
+For the full list of methods available from the API you can check [here](https://github.com/trainline/python-environment_manager/blob/master/environment_manager/api.py)