Add documentation to support developers

[tatiana]

Add documentation to support developers, including:

1. Overview of how to contribute
2. How to set up the local development environment
3. Running tests
4. Pre-commit and linting
5. Authoring the documentation
6. Releasing

Closes: #232

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.68%. Comparing base (c181a5f) to head (af863fd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #343   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files          10       10           
  Lines         792      792           
=======================================
  Hits          742      742           
  Misses         50       50           

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[pankajkoti]

This is a great help for contributors, thanks a lot for adding this!

LGTM, few minor cosmetic suggestions inline.

[lzdanski]

Copyediting review

[tatiana]

Thank you so much for the thorough review and documentation lesson, @lzdanski ! I've taken notes for the following documents I do - so I can avoid the same mistakes. I addressed all the feedback.