Add dev setup instructions like earthkit-data

[samsammurphy]

• [ ] conda environment
• [ ] git hooks (scripts that run automatically when certain git events occur
• [ ] pre-commit (framework for managing git hooks)
• [ ] pyproject.toml (describes the earthkit-hydro python package)
• [ ] developer instructions

Developer instructions might be something like this (thanks @sandorkertesz )

1. mamba env create -f environment.yml
2. pre-commit install
3. pip install -e . --no-deps

The third instruction will install the python package in the current directory in editable mode (i.e. hot reloading any local changes without needing to reload the package) the no-deps flags asks pip not to install dependencies of the current directory package.

[samsammurphy]

also make it easier to manage Jupyter Notebooks with git

$ nbstripout --install
$ nbdime config-git --enable --global

[samsammurphy]

"Rich Jupyter Notebook Diffs" GitHub feature preview might solve the jupyter notebook <> git problem..

thanks @dtip