DEV: Add pull request template

.github/pull_request_template.md

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+Resolves #issue
+
+Briefly describe changes here, e.g. "Added a precise description about the
+changes made to the code, and what the PR is solving."
+
+## Checklist
+
+- [ ] Tests added (if not, comment why)
+- [ ] Test coverage equal or up from main (run pytest with `--cov=<packagename> --cov-report term-missing`)
+- [ ] If not squash merging, every commit passes tests
+- [ ] Appropriate [commit prefix](https://upgraded-funicular-eywe4gy.pages.github.io/developing/#commit-prefixes) and precise commit message used
+- [ ] All debug prints and unnecessary comments removed
+- [ ] Docstrings are correct and updated
+- [ ] Documentation is updated, if necessary
+- [ ] Latest main rebased/merged into branch
+- [ ] Added comments on this PR where appropriate to help reviewers
+- [ ] Moved issue status on project board
+- [ ] Checked the boxes in this checklist ✅