[w3c/permissions] docs: Restore pieces of CONTRIBUTING.md lost in abe8198c22. (#157)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/157

-- Commit Summary --

  * docs: Restore pieces of CONTRIBUTING.md lost in abe8198c22.

-- File Changes --

    M CONTRIBUTING.md (32)

-- Patch Links --

https://github.com/w3c/permissions/pull/157.patch
https://github.com/w3c/permissions/pull/157.diff

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