Add pull request template

.github/pull_request_template.md

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+## Description
+
+<!-- Briefly describe what this PR does -->
+
+## Motivation
+
+<!-- Why is this change needed? Link to related issues if applicable -->
+
+Fixes # <!-- issue number, if applicable -->
+
+## Changes
+
+<!-- List the main changes in this PR -->
+
+-
+
+## Type of Change
+
+<!-- Mark the relevant option with an "x" -->
+
+- [ ] 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 change)
+- [ ] Performance improvement
+- [ ] Documentation update
+- [ ] Code refactoring (no functional changes)
+- [ ] Build/CI changes
+
+## Testing
+
+<!-- Describe how you tested your changes -->
+
+- [ ] I have tested this on SM90 (Hopper) GPU
+- [ ] I have tested this on SM100 (Blackwell) GPU
+- [ ] I have run the relevant test files (`python tests/test_*.py`)
+- [ ] I have verified there are no performance regressions
+
+## Checklist
+
+<!-- Mark completed items with an "x" -->
+
+- [ ] My code follows the project's coding style
+- [ ] I have commented my code where necessary
+- [ ] I have updated the documentation if needed
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix/feature works
+- [ ] All existing tests pass locally
+
+## Additional Notes
+
+<!-- Any additional information that reviewers should know -->
+