[skip ci] Add badges

Author: oesteban

README.md

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 # python-client
 A python client to query TemplateFlow via datalad
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+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.2583289.svg)](https://doi.org/10.5281/zenodo.2583289)
+[![CircleCI](https://circleci.com/gh/templateflow/python-client/tree/master.svg?style=shield)](ttps://circleci.com/gh/templateflow/python-client/tree/master)
+[![Pypi](https://img.shields.io/pypi/v/templateflow.svg)](https://pypi.python.org/pypi/templateflow/)