Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+Please provide a brief description of your changes.
+
+## Related Issue
+Link to an existing issue if applicable: Fixes #123
+
+## Changes Made
+- [ ] Added feature XYZ
+- [ ] Fixed bug ABC
+- [ ] Updated documentation
+
+## Checklist
+- [ ] Code follows [project guidelines](CONTRIBUTING.md)
+- [ ] Tests have been added or updated
+- [ ] Documentation has been updated
+- [ ] All tests pass locally
+
+## Screenshots (if applicable)
+Add screenshots to help illustrate your changes.
+
+## Additional Notes
+Anything else reviewers should know?