Add PR template for structured contributor PRs

.github/pull_request_template.md

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+## Description
+
+Please include a summary of the change and which issue is fixed. Also include relevant motivation and context.
+
+Fixes # (issue)
+
+---
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Other (please describe):
+
+---
+
+## References
+
+List any related issues, PRs, or external references relevant to this change.
+
+---
+
+## Code changes
+
+Briefly describe the main code changes made in this PR.
+
+---
+
+## User-facing changes
+
+Describe any changes visible to users (UI, behavior, output, etc.).
+
+---
+
+## Backwards-incompatible changes
+
+List any changes that might break backwards compatibility.
+
+---
+
+## How Has This Been Tested?
+
+Describe the tests that were run to verify your changes.
+
+- [ ] Test A
+- [ ] Test B
+
+---
+
+## Checklist
+
+- [ ] My code follows the project’s style guidelines
+- [ ] I have performed a self-review of my own changes
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+
+---
+
+## Additional Notes
+
+Add any other context about the PR here.