📝 docs: add Contributing guidelines

CONTRIBUTING.md

@@ -0,0 +1,30 @@
+# Contributing to tabi
+
+Halló!
+
+Thanks for contributing to [tabi](https://github.com/welpo/tabi). Before implementing new features and changes, please [submit an issue](https://github.com/welpo/tabi/issues/new) so that we can discuss it.
+
+We welcome contributions in many forms, including:
+- Bug reports
+- Feature requests
+- Code patches
+- Documentation improvements
+- UI/UX suggestions
+
+If you're not sure how to contribute or need help with something, please don't hesitate to reach out via the [issue tracker](https://github.com/welpo/tabi/issues) or [mail](mailto:hi@welpo.ooo?subject=[GitHub]%20tabi).
+
+## How to submit a pull request?
+
+- Follow the [GitHub flow](https://guides.github.com/introduction/flow/).
+- Follow the [Conventional Commits Specification](https://www.conventionalcommits.org/en/v1.0.0/)
+- Use [gitmoji](https://gitmoji.dev/) – it's fun!
+
+## Code of Conduct
+
+We expect all contributors to follow our [Code of Conduct](./CODE_OF_CONDUCT.md). Please be respectful and professional when interacting with other contributors.
+
+## License
+
+The code is available under the [MIT license](./LICENSE).
+
+Thank you for your contributions!