chore: add pull request template

For when people make PRs they'll have a scaffold to use.

Author: Tygo-van-den-Hurk

.github/PULL_REQUEST_TEMPLATE.md

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+
+<!-- ^ Please summarise the changes you have made and explain why they are necessary above here ^ -->
+
+## Checklist
+
+<!-- Please check what applies. Note that these are not hard requirements but merely serve as information for reviewers. -->
+
+- [ ] Made sure my pull request fits [CONTRIBUTING.md].
+- [ ] Marked commits with `!` if they were breaking changes.
+- [ ] Updated the `docs/` when needed.
+- [ ] Added tests to `test/` for all new code.
+- [ ] This pull request does not fix a security issue. (See [SECURITY.md])
+
+[CONTRIBUTING.md]: https://github.com/Tygo-van-den-Hurk/Slyde/blob/master/CONTRIBUTING.md
+[SECURITY.md]: https://github.com/Tygo-van-den-Hurk/Slyde/blob/master/SECURITY.md
+
+## Meta data
+
+Built on platform (select all applicable):
+- [ ] Linux (x86_64)
+- [ ] Linux (aarch64)
+- [ ] Macos (x86_64)
+- [ ] Macos (aarch64)
+- [ ] Windows (x86_64)
+- [ ] Windows (aarch64)
+- [ ] other: ...
+
+---
+
+Add a :+1: [reaction] to [pull requests you find important].
+
+[reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/
+[pull requests you find important]: https://github.com/Tygo-van-den-Hurk/Slyde/pulls?q=is%3Aopen+sort%3Areactions-%2B1-desc