Please provide type annotations for quaternions.

[jscheidtmann]

Is your feature request related to a problem? Please describe. I am using quaternion in a project that uses type annotations and checks the code using mypy: error: Skipping analyzing "quaternion": module is installed, but missing library stubs or py.typed marker [import-untyped]

Describe the solution you'd like Please provide type annotations or stubs

Describe alternatives you've considered At the moment one needs to deactivate type checking on quaternion and go unchecked.