CONTRIBUTING.md

This is still in progress, and more reminder to look write proper information, till then I use it to gather links and notes around the topic as I'm still pretty new to open source collaboration.

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some inspiration

• https://github.com/remarkjs/remark/blob/master/code-of-conduct.md
• https://www.contributor-covenant.org/version/1/4/code-of-conduct.md
• https://opensource.guide/code-of-conduct/
• http://citizencodeofconduct.org/