read readme in setup.py, for rending on pypi

It would look something like this (after the contents of the README.md have been translated to rst format):
https://testpypi.python.org/pypi/cdap-auth-client/1.0.1

Same Note as: https://github.com/caskdata/cdap-ingest/pull/89#issue-46588719

EDIT:
Resolution is to simply link to the README on github as Package Documentation on PyPi
https://pypi.python.org/pypi/cdap-auth-client