Merge pull request #5554 from commercialhaskell/update-community-links

Update community links

Author: snoyberg

README.md

@@ -3,9 +3,18 @@
 ![Unit tests](https://github.com/commercialhaskell/stack/workflows/Unit%20tests/badge.svg)
 ![Integration tests](https://github.com/commercialhaskell/stack/workflows/Integration%20tests/badge.svg)
 [![Release](https://img.shields.io/github/release/commercialhaskell/stack.svg)](https://github.com/commercialhaskell/stack/releases)
-[![Join the chat at https://gitter.im/commercialhaskell/stack](https://badges.gitter.im/commercialhaskell/stack.svg)](https://gitter.im/commercialhaskell/stack?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Stack is a cross-platform program for developing Haskell projects. It is intended for Haskellers both new and experienced.
 
 See [haskellstack.org](http://haskellstack.org) or the [doc](./doc) directory for more
 information.
+
+### Community
+
+You can participate with the Stack community in the following areas:
+
+* [Haskell Foundation Slack](https://join.slack.com/t/haskell-foundation/shared_invite/zt-mjh76fw0-CEjg2NbyVE8rVQDvR~0F4A)
+    * `#stack-users` for general Stack discussion
+    * `#stack-collaborators` for working on the Stack code base
+* [Stack Google Group mailing list](https://groups.google.com/g/haskell-stack)
+* [Haskell Community Discourse](https://discourse.haskell.org/)