isolated contributing info

Author: Ethan Shanahan

CONTRIBUTING.md

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+# Contributing
+
+If you are planning on contributing to AiiDA-FANS, please consider the following guidelines. Additionally, it is strongly recommended to use the pixi package manager to install the appropriate development environment. After cloning this repository, simply run `pixi install` and use the default environment.
+
+## Development
+1. Branch off `dev` with a name appropriate for what you are working on (e.g. `feat/myfeature` or `bug/badbug`).
+2. Implement, commit, and push your changes.
+3. Open a Pull Request into `dev` (e.g. `dev ← feat/myfeature`), then merge and delete your branch.
+
+## Release
+1. Open a Pull Request `main ← dev`, then merge but do **not** delete `dev`.
+2. Draft a new Release and assign it a new Tag according to the new version number (e.g. `v1.2.3`).
+3. Generate release notes and publish the Release.