Update README.md (#81)

README.md

@@ -4,7 +4,7 @@
 [![Coverage Status](https://img.shields.io/codecov/c/github/lyft/amundsenmetadatalibrary/master.svg)](https://codecov.io/github/lyft/amundsenmetadatalibrary?branch=master)
 [![License](https://img.shields.io/:license-Apache%202-blue.svg)](LICENSE)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](#developer-guide)
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+[![Slack Status](https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social)](https://amundsenworkspace.slack.com/join/shared_invite/enQtNTk2ODQ1NDU1NDI0LTc3MzQyZmM0ZGFjNzg5MzY1MzJlZTg4YjQ4YTU0ZmMxYWU2MmVlMzhhY2MzMTc1MDg0MzRjNTA4MzRkMGE0Nzk)
 
 Amundsen Metadata service serves Restful API and is responsible for providing and also updating metadata, such as table & column description, and tags. Metadata service can use Neo4j or Apache Atlas as a persistent layer.