Add pull_request_template.md.

.github/pull_request_template.md

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+## Description
+<!-- Provide a brief description of the changes introduced by this PR -->
+
+## Related Issue
+<!-- Link to the related issue (if applicable) using #issue_number -->
+
+## Type of Change
+<!-- Put an `x` in the boxes that apply -->
+
+- [ ] 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
+- [ ] Code refactoring
+- [ ] Performance improvement
+
+## How Has This Been Tested?
+<!-- Describe the tests you ran to verify your changes -->
+
+## Screenshots (if applicable)
+<!-- Add screenshots to help explain your changes -->
+
+## Checklist
+<!-- Put an `x` in the boxes that apply -->
+
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my own 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
+
+## Additional Notes
+<!-- Add any additional notes or context about the PR here -->