Contribution guideline and PR template don't mention semantic PR/Conventional Commits

[Bananeweizen]

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I've raised my first PR today. It failed initial checks, although I followed the contribution guideline and PR template. Neither one mentions the necessity for PR titles in this repository to match a certain pattern, which is then enforced by this bot during PR checks: https://github.com/Ezard/semantic-prs

It would be good to document that necessity in contribution guideline and PR template.

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[rarkins]

PRs welcome! All markdown you see is within this repo. Use docs: prefix for any such changes :)