docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We welcome contributions to Quickemu.
+
+- Help other Quickemu users by answering questions in the [Quickemu Discussions](https://github.com/quickemu-project/quickemu/discussions) 🛟
+- Improve the documentation in [this README](https://github.com/quickemu-project/quickemu/edit/master/README.md) and the [Quickemu Wiki](https://github.com/quickemu-project/quickemu/wiki) 📖
+- File bug reports and feature requests in the [Quickemu Issues](https://github.com/quickemu-project/quickemu/issues) 📁
+- Submit [Quickemu Pull requests](https://github.com/quickemu-project/quickemu/pulls) to fix bugs 🐞 or add new features ✨
+  - Follow our [guide to adding a new OS to quickget](https://github.com/quickemu-project/quickemu/wiki/06-Advanced-quickget-features#adding-a-new-os-to-quickget)
+  - Commit messages must [conform to the Conventional Commits specification](https://www.conventionalcommits.org/).
+- [Sponsor the project](https://github.com/sponsors/flexiondotorg) 💖