docs: add pull request template

Co-Authored-By: Hoai thuong Nguyen van <admin@huynhthuong.online>

Author: devin-ai-integration[bot]

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,23 @@
+## Description
+
+<!-- Provide a brief description of your changes. -->
+
+## Type of Change
+
+- [ ] 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
+
+## Testing
+
+<!-- Describe the tests you ran and how to reproduce them. -->
+
+## Checklist
+
+- [ ] My code follows the project's code style
+- [ ] I have tested my changes locally
+- [ ] I have added/updated documentation as needed
+- [ ] My changes do not introduce new warnings