Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Alchemist
+
+Thanks for your interest in contributing to **Alchemist**. Contributions are welcome, but please read this document carefully before submitting anything.
+
+## License
+
+Alchemist is licensed under the **GNU General Public License v3.0 (GPL-3.0)**.
+
+By contributing to this project, you agree that your contributions will be licensed under the same GPL-3.0 license.
+
+## Copyright & Ownership
+
+By submitting a contribution (code, documentation, assets, or any other material), you agree that:
+
+- You **grant the project owner (Brooklyn Halmstad)** a **perpetual, irrevocable, worldwide right** to use, modify, relicense, and redistribute your contribution as part of the project.
+- You retain copyright to your individual contribution, **but you grant the project owner full rights to incorporate it into Alchemist**, including future relicensing or dual-licensing if desired.
+- You confirm that you have the legal right to submit the contribution and that it is your own original work (or properly attributed and compatible with GPL-3.0).
+
+In short: you keep authorship credit, but the project owner controls the project.
+
+## Contributor License Agreement (CLA)
+
+At this time, **no separate CLA document is required**.
+
+By opening a pull request, submitting a patch, or otherwise contributing, you are implicitly agreeing to the terms outlined in this file.
+
+## Contribution Guidelines
+
+- Keep changes focused and minimal.
+- Follow existing code style and architecture.
+- Do not introduce new dependencies without discussion.
+- Large or breaking changes should be discussed in an issue first.
+- All contributions must build and run cleanly.
+
+Low-effort PRs will be closed.
+
+## Code of Conduct
+
+Don’t be a jerk. Act in good faith. Respect other contributors.