[Feature Request]: Add missing `py.typed` file

[Andrew-S-Rosen]

Problem

I am trying to use mypy on a package that uses emmet.core as a dependency, but it can't use any of emmet's type hints because there is no py.typed marker in the directory.

Example:

Skipping analyzing "emmet.core.math": module is installed, but missing library stubs or py.typed marker

Proposed Solution

Add a py.typed file.

Alternatives

No response