feat: add pull request description template

Author: smortezah

.copilot-pull-request-description-instructions.md

@@ -0,0 +1,124 @@
+## Description
+
+<!-- Provide a clear and concise description of your changes -->
+
+## Type of Change
+
+<!-- Mark the relevant option with an [x] -->
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Refactoring (no functional changes)
+- [ ] Performance improvement
+- [ ] Test coverage improvement
+
+## Related Issues
+
+<!-- Link any related issues using #issue_number -->
+
+Closes #
+
+## Changes Made
+
+<!-- List the main changes in this PR -->
+
+-
+-
+-
+
+## SPEC Compliance
+
+<!-- If this PR relates to the TOON spec, indicate which sections are affected -->
+
+- [ ] This PR implements/fixes spec compliance
+- [ ] Spec section(s) affected:
+- [ ] Spec version:
+
+## Testing
+
+<!-- Describe the tests you added or ran -->
+
+- [ ] All existing tests pass
+- [ ] Added new tests for changes
+- [ ] Tested on Python 3.8
+- [ ] Tested on Python 3.9
+- [ ] Tested on Python 3.10
+- [ ] Tested on Python 3.11
+- [ ] Tested on Python 3.12
+
+### Test Output
+
+```bash
+# Paste test output here
+```
+
+## Code Quality
+
+<!-- Confirm code quality checks -->
+
+- [ ] Ran `ruff check src/toon_format tests` - no issues
+- [ ] Ran `ruff format src/toon_format tests` - code formatted
+- [ ] Ran `mypy src/toon_format` - no critical errors
+- [ ] All tests pass: `pytest tests/ -v`
+
+## Checklist
+
+<!-- Mark completed items with an [x] -->
+
+- [ ] My code follows the project's coding standards (PEP 8, line length 100)
+- [ ] I have added type hints to new code
+- [ ] I have added tests that prove my fix/feature works
+- [ ] New and existing tests pass locally
+- [ ] I have updated documentation (README.md, CLAUDE.md if needed)
+- [ ] My changes do not introduce new dependencies
+- [ ] I have maintained Python 3.8+ compatibility
+- [ ] I have reviewed the [TOON specification](https://github.com/toon-format/spec) for relevant sections
+
+## Performance Impact
+
+<!-- If applicable, describe any performance implications -->
+
+- [ ] No performance impact
+- [ ] Performance improvement (describe below)
+- [ ] Potential performance regression (describe and justify below)
+
+<!-- Details: -->
+
+## Breaking Changes
+
+<!-- If this is a breaking change, describe the migration path for users -->
+
+- [ ] No breaking changes
+- [ ] Breaking changes (describe migration path below)
+
+<!-- Migration path: -->
+
+## Screenshots / Examples
+
+<!-- If applicable, add screenshots or example output -->
+
+```python
+# Example usage
+```
+
+Output:
+```
+# Example output
+```
+
+## Additional Context
+
+<!-- Add any other context about the PR here (optional) -->
+
+## Checklist for Reviewers
+
+<!-- For maintainers reviewing this PR -->
+
+- [ ] Code changes are clear and well-documented
+- [ ] Tests adequately cover the changes
+- [ ] Documentation is updated
+- [ ] No security concerns
+- [ ] Follows TOON specification
+- [ ] Backward compatible (or breaking changes are justified and documented)