add badges

Author: gkorland

README.md

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+[![license](https://img.shields.io/github/license/RedisGraph/redisgraph-bulk-loader.svg)](https://github.com/RedisGraph/redisgraph-bulk-loader)
+[![CircleCI](https://circleci.com/gh/RedisGraph/redisgraph-bulk-loader/tree/master.svg?style=svg)](https://circleci.com/gh/RedisGraph/redisgraph-bulk-loader/tree/master)
+[![GitHub issues](https://img.shields.io/github/release/RedisGraph/redisgraph-bulk-loader.svg)](https://github.com/RedisGraph/redisgraph-bulk-loader/releases/latest)
+[![Codecov](https://codecov.io/gh/RedisGraph/redisgraph-bulk-loader/branch/master/graph/badge.svg)](https://codecov.io/gh/RedisGraph/redisgraph-bulk-loader)
+
+[![Mailing List](https://img.shields.io/badge/Mailing%20List-RedisGraph-blue)](https://groups.google.com/forum/#!forum/redisgraph)
+[![Gitter](https://badges.gitter.im/RedisLabs/RedisGraph.svg)](https://gitter.im/RedisLabs/RedisGraph?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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 # redisgraph-bulk-loader
 A Python utility for building RedisGraph databases from CSV inputs