Added PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Pull Request template
+
+Open the PR as a **draft**, and go through the self-review checklist before marking it as **ready for review**.
+
+**Checklist before requesting a review:**
+
+- [ ] My solution follows the software design principles: DRY, YAGNI, KISS, PoLA, and SOLID (unless a major refactoring would be required).
+- [ ] I have not mixed refactoring changes with functionality changes (these should made in another PR that can be conducted in parallel but merged first).
+- [ ] I have commented on my code in non-obvious areas.
+- [ ] When adding or renaming environment variables, I have updated all relevant places.
+- [ ] I have made corresponding changes to the documentation.
+- [ ] I have outlined all the changes in the PR comment.
+- [ ] The PR title describes the changes accurately.
+- [ ] (optional) The PR title starts with related user story / issue number.
+
+⚠️ Before requesting a review, delete the above checklist, leaving only the list of changes made.