docs: add MIT license and CONTRIBUTING guide

Author: casper-justus

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing! Contributions are welcome in the form of bug reports, workflow improvements, new device support, and documentation fixes.
+
+## Getting Started
+
+1. **Fork** the repository and create a new branch from `main`:
+   ```bash
+   git checkout -b feat/your-feature-name
+   ```
+2. Make your changes.
+3. Test the workflow by running it manually via the **Actions** tab on your fork.
+4. Open a **Pull Request** against `main` with a clear description of what you changed and why.
+
+## What You Can Contribute
+
+- 📱 **New device support** — add defconfig mappings and AnyKernel3 device entries for other Samsung devices
+- 🔧 **Workflow improvements** — faster build steps, better caching, toolchain upgrades
+- 🐛 **Bug fixes** — patches for build failures, Kconfig issues, or packaging problems
+- 📚 **Documentation** — clearer instructions, more device flash guides, translated READMEs
+
+## Pull Request Guidelines
+
+- Keep PRs focused — one change per PR
+- Use clear, descriptive commit messages (e.g. `fix: correct Mali Kconfig sed pattern`)
+- If adding a new device, include the device name, codename, and model number in the PR description
+- Ensure the workflow still passes on your fork before submitting
+
+## Reporting Issues
+
+If a build fails, please open an issue and attach:
+- The **compile log** artifact from the failed Actions run
+- The kernel source URL and branch you used
+- The KernelSU tag used
+- Your device model
+
+## Code of Conduct
+
+Be respectful. This is an open project and everyone is welcome regardless of experience level.

LICENSE

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+MIT License
+
+Copyright (c) 2026 Justus Njagi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.