[Rpm-maint] [rpm-software-management/rpm] Add CONTRIBUTING.md (#1709)

[Demi Marie Obenour]

This is very much a draft and I am hoping for feedback from @pmatilai
before merging.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1709

-- Commit Summary --

  * Add CONTRIBUTING.md

-- File Changes --

    A CONTRIBUTING.md (18)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1709.patch
https://github.com/rpm-software-management/rpm/pull/1709.diff

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