LICENSE and CONTRIBUTING + README

CONTRIBUTING.md

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+# Contributing to Cagire
+
+Contributions are welcome. There are many ways to contribute beyond code:
+
+- **Bug reports**: Open an issue describing the problem and steps to reproduce.
+- **Feature requests**: Suggest new features or improvements.
+- **Documentation**: Fix typos, clarify explanations, or add examples.
+- **Testing**: Try Cagire on different platforms, report issues.
+
+## Prerequisites
+
+- **Rust** (stable toolchain) - [rustup.rs](https://rustup.rs/)
+
+## Quick start
+
+```sh
+cargo build
+cargo clippy
+cargo run
+```
+
+## Code contributions
+
+1. Fork the repository
+2. Create a branch for your changes
+3. Make your changes
+4. Run `cargo clippy` and fix any warnings
+5. Submit a pull request with a clear description
+
+Explain the reasoning behind your changes. Document what problem you're solving and how your solution works.
+
+## Code of conduct
+
+This project follows the [Contributor Covenant 2.1](https://www.contributor-covenant.org/version/2/1/code_of_conduct/). By participating, you agree to uphold its standards.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under AGPLv3.