* Draft contributors.md update
This is a proposed updated to the contributors.md document inspired by
the contributing guidelines of the actions/cache project [1]. There are
some differences, most notable the inclusion of "Development Details"
which explains and motivates the development tools (to an extend).
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1. https://github.com/actions/cache/blob/eed9cfe64d00dd64cbb36bec915d41dd6fab9f6c/CONTRIBUTING.md
* Split Contributing Guidelines and Development Handbook
Split the "Contributing Guidelines" currently found in
docs/contributors.md into a CONTRIBUTING.md file, containing the
Contributing Guidelines, and a docs/development.md file, containing
details on how the development/testing of this project works.
Eric Cornelissen
e26bf79ffc