docs: pr template (#713)

.github/pull_request_template.md

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+<!-- Describe your changes -->
+
+Fixes # (issue)
+
+## How was this PR tested?
+
+<!-- What did you do to test your changes? -->
+
+- [ ] Test A
+- [ ] Test B
+
+## Checklist:
+
+- [ ] I have carefully read [the contributing guidelines](https://developers.stoat.chat/developing/contrib/)
+- [ ] I have performed a self-review of my own code
+- [ ] I have made corresponding changes to the documentation if applicable
+- [ ] I have no unrelated changes in the PR
+- [ ] I have confirmed that any new dependencies are strictly necessary
+- [ ] I have written tests for new code (if applicable)
+- [ ] I have followed naming conventions/patterns in the surrounding code
+
+## Please declare, if any, LLM usage involved in creating this PR
+
+...