Add CONTRIBUTING.md

Author: Mr-Milk

CONTRIBUTING.md

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+# Contributing
+
+
+## Contributing code
+
+We use [uv](https://docs.astral.sh/uv/) to manage our development environment. 
+
+
+### Setup
+
+Setup your development environment by running:
+
+```bash
+uv lock
+```
+
+Install pre-commit hook
+
+```bash
+uv run pre-commit install
+```
+
+Start a IPython/Jupyter session by running:
+
+```bash
+uv run --with ipython ipython
+# or
+uv run --with jupyter jupyter lab
+```
+
+### Test
+
+To run the tests, use:
+
+```bash
+uv run task test
+```
+
+### Documentation
+
+To build the documentation, use:
+
+```bash
+# Build doc with cache
+uv run task doc-build
+# Fresh build
+uv run task doc-clean-build
+```
+
+To serve the documentation, use:
+
+```bash
+uv run task doc-serve
+```
+
+This will start a local server at [http://localhost:8000](http://localhost:8000).