PR request template

Author: LucaBonamino

.github/pull_request_template.md

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+## Description
+
+Briefly describe the changes in this pull request.
+
+## Type of change
+
+Please check the relevant option:
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Performance improvement
+- [ ] Documentation update
+- [ ] Refactor / cleanup
+
+## Changes made
+
+- 
+- 
+- 
+
+## Testing
+
+Describe how you tested these changes:
+
+- [ ] Existing tests pass
+- [ ] New tests added (if applicable)
+- [ ] Manual testing
+
+## Checklist
+
+- [ ] Code builds successfully
+- [ ] Public APIs are documented
+- [ ] Documentation updated (if needed)
+- [ ] No breaking changes (or clearly documented)
+
+## Related issues
+
+Closes # (if applicable)

CONTRIBUTING.md

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+# Contributing to lin_algebra
+
+Thank you for your interest in contributing!
+
+This project is open to:
+- bug fixes
+- performance improvements
+- documentation improvements
+- examples and tests
+
+---
+
+## How to contribute
+
+1. Fork the repository
+2. Create a new branch from `main`
+3. Make your changes
+4. Open a Pull Request against `main`
+
+Please keep pull requests focused and well-described.
+
+---
+
+## Development setup
+
+```bash
+cargo build
+cargo test
+```
+
+
+## Code Style
+- Prefer clear names over clever code
+- Add docstrings for public methods
+- Add tests for new functionality when possible
+
+## Question or ideas?
+Feel free to open an issue to discuss changes before starting work.