feat/add-pull-request-template (#604)

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Briefly describe the purpose of this pull request. What changes are introduced, and why? -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Refactor
+- [ ] Other (please describe):
+
+## Related Issues
+
+<!-- List any related issues or reference other PRs, if applicable. Example: Fixes #123, Closes #456 -->
+
+## Testing
+
+- [ ] Tests added or updated
+- [ ] No tests required
+
+<!-- Briefly describe the testing that was done. Include steps to manually test or reference automated tests. -->
+
+## Checklist
+
+- [ ] Code is well-documented
+- [ ] Changelog is updated (if needed)
+- [ ] No sensitive information (e.g., keys, credentials) is included in the code
+- [ ] All PR feedback is addressed
+
+## Additional Notes
+
+<!-- Any additional notes or comments to help the reviewer. -->