Zarr core protocol for storage and retrieval of N-dimensional typed arrays

For the v1 and v2 specs, please see https://github.com/zarr-developers/zarr-python/tree/main/docs/spec.

The rendered docs of the main branch are available at https://zarr-specs.readthedocs.io

The following steps install the necessary packages to render the specs with automatic updating and reloading of changes:

## optionally setup an venv
# python3 -m venv .venv
# . .venv/bin/activate
pip install -r docs/requirements.txt
pip install sphinx-autobuild
sphinx-autobuild -a docs docs/_build/html