Bring into compliance with PureScript Contributors Library Guidelines

[pete-murphy]

https://github.com/purescript-contrib/governance/blob/main/library-guidelines.md

Libraries in the Contributors organization are expected to:

• Have at least one (and preferably more) assigned maintainers, as indicated by badges in the project README.
• Have adequate documentation in the form of module documentation published to Pursuit, a README containing a library summary, installation instructions, and more, and a docs directory containing at least a short tutorial (see the documentation section below).
• Have a CHANGELOG.md in the root directory.
• Have an adequate test suite which is exercised by continuous integration (see the tests section below)
• Use the standard Contributors repository structure, which can be generated with the contrib-updater tool (see the repository structure section below).
• Use a default branch of main for the repository.

TODO

• Add maintainer badge
  
• Split documentation into a "quick start" (to keep in README.md) and the rest of examples could go in docs
• Link to TryPureScript for quick start and docs/README.md examples
• Generate CHANGELOG (using purescript-contrib/chnglg)

A .github directory containing issue templates, pull request templates, contributing guide, and workflows for tests in continuous integration and automatically labeling stale issues and pull requests.

• Issue template
• PR template
• Contributing guide