stack-3.9.1: README.md

## Stack

[![Unit tests](https://github.com/commercialhaskell/stack/workflows/Unit%20tests/badge.svg)](https://github.com/commercialhaskell/stack/actions/workflows/unit-tests.yml)
[![Integration tests](https://github.com/commercialhaskell/stack/workflows/Integration%20tests/badge.svg)](https://github.com/commercialhaskell/stack/actions/workflows/integration-tests.yml)
[![Release](https://img.shields.io/github/release/commercialhaskell/stack.svg)](https://github.com/commercialhaskell/stack/releases)

Stack is a program for developing Haskell projects. It is aimed at new and
experienced users of Haskell and seeks to support them fully on Linux, macOS
and Windows.

See [haskellstack.org](http://haskellstack.org), or the [doc](./doc) directory
of this repository, for more information.

### Learning to use Stack

If you are learning to use Stack and have questions, a discussion at the
[Haskell Community](https://discourse.haskell.org/) forum may help. See its
'Learn' category.

### Community

You can participate with the Stack community in the following areas:

* the [Haskell Community](https://discourse.haskell.org/) forum

* the Haskell
  [Stack and Stackage](https://matrix.to/#/#haskell-stack:matrix.org)
  room (address `#haskell-stack:matrix.org`) on [Matrix](https://matrix.org/)