PEP 561 Compliance

[Mshivam2409]

Hey, first of all, thank you so much for this awesome package.

The package is mostly completely typed, but the absence of a py.typed marker raises errors with mypy. Would it be possible to add a marker to make it PEP 561 compliant?

[surenkov]

Hi @Mshivam2409, thanks for reporting this.

Added this marker to the package, will be delivered to PyPI with the following release.