docs: add pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+---
+title: ""
+---
+
+## Description
+
+Provide a brief description of what this pull request is doing. Explain the purpose of the changes and how they address
+the related issue or feature.
+
+## Related Issues
+
+Link any related issues or feature requests. For example:
+
+- Fixes #[issue-number]
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Refactoring
+- [ ] Documentation update
+- [ ] Other (please describe):
+
+## Checklist
+
+- [ ] My code follows the style guidelines of this project
+- [ ] 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
+- [ ] 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 in downstream modules
+
+## Additional Context / Screenshots (if appropriate)
+
+Provide any additional context or screenshots that might help the reviewer understand the pull request better.