Where's the document of this library?

As I look around and find no specific documentation about how to use datashape. Thus I don't know how to invoke its APIs and understand the input and output.
Even https://datashape.readthedocs.io/en/latest/index.html just tells the definition and grammar.
Or should I read the source codes directly?

Start by reviewing the existing documentation at datashape.readthedocs.io/en/latest/index.html and the library source to identify the public APIs and usage gaps. Document how to invoke the APIs and describe their expected inputs and outputs, so users can learn to use datashape without reading the source directly.

Written by the indexing model from the issue text.