Add contributing guidelines

CONTRIBUTE.md

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+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via issue,
+email, or any other method with the owners of this repository before making a change.
+
+Here are areas that can be improved in this library:
+
+- Add [genes](src/gentun/genes.py#L11-L47) and [models](src/gentun/models/base.py#L9-L25) to
+support more paper implementation
+- Add a method to share the training data between the controller node and workers
+- Add some type of proof-of-work validation for workers
+
+You can also help us speed up hyperparameter search by contributing your spare GPU time.
+
+There was a major refactor of this library in 2024, the old version is still available in
+the [`old` branch](https://github.com/gmontamat/gentun/tree/old). Some cool forks added
+features to this release.
+
+## Pull Request Process
+
+1. Ensure your branch is linted with `black` and `isort` using
+   the [pyproject.toml](./pyproject.toml) configurations.
+2. Update the README.md with details of changes to the interface, this includes new environment
+   variables, exposed ports, useful file locations and container parameters.
+3. Increase the version numbers in any examples files and the README.md to the new version that this
+   Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
+4. Use [The Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/) in
+   your PR title and description.