This project is pretty well documented.
There is complete reference documentation and a document that gives an overview of the code’s design.
What seems still lacking is documentation that helps to get started using mdarray.
As far as I can see this is currently limited to the starting page of the documentation.
I think that an efficient way to plug this gap would be to provide a NumPy-to-mdarray translation table.
It could be similar to https://docs.rs/ndarray/latest/ndarray/doc/ndarray_for_numpy_users/index.html.
NumPy is widely known, so this would be a good way to introduce the library to people without writing an extensive tutorial.