feat: add PR template with checklist (#21)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,35 @@
+# Pull Request
+
+## Description
+<!-- Provide a brief description of the changes in this PR -->
+
+## Related Issue
+<!-- Link to the related issue(s) this PR addresses -->
+Fixes #(issue number)
+
+## Type of Change
+<!-- Mark the relevant option with an [x] -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Performance improvement
+- [ ] Code refactoring
+- [ ] Other (please describe):
+
+## Checklist
+<!-- Mark completed items with [x] -->
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my code
+- [ ] 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
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published
+
+## Screenshots (if applicable)
+<!-- Add screenshots to help explain your changes -->
+
+## Additional Notes
+<!-- Add any other context or notes about the PR here -->