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

[Florian Festi]

@ffesti pushed 5 commits.

208179fe337e219ff2dc736368500278ed0f6d1f  CONTRIBUTING: PRs
c32dccd5ce74c7c9af4880e71cc2015f4703de04  Contributing: Adjust Headings
07cc4d7cedc560260b9361d7ccbf9d551faff5c8  Contributing: Comments and Commit messages
c6e60373eeb7a19836b9fb53870788e71bfb9e0f  Contributing: Emacs formatting
29fd9a14ee6bd0bc3ad9baf971868e4c1db01694  Contributing: Intro


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View it on GitHub:
https://github.com/rpm-software-management/rpm/pull/1709/files/02dc737fc65426b36671f62e0f42c6a48fc20579..29fd9a14ee6bd0bc3ad9baf971868e4c1db01694
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