Add PR template

.github/pull_request_template.md

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+## Summary
+
+_A brief description of changes and motivation behind them._
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change fixing an issue)
+- [ ] New feature (non-breaking change adding functionality)
+- [ ] Breaking change (fix or feature causing existing functionality to not work as expected)
+- [ ] Refactoring (no functional changes)
+- [ ] Documentation update
+
+## Changes Made
+
+- ...
+
+## Checklist
+
+- [ ] Code follows project style guidelines
+- [ ] Self-review completed
+- [ ] Tests added for new functionality
+- [ ] Documentation updated (if needed)
+
+## Reviewer Notes
+
+N/A