Create py.typed for mypy compatibility

[elliotgunton]

Fixes #108

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[pwwang]

Could you also add yourself as a contributor in README.md?

[sambhav]

@pwwang thanks for merging and tagging a release! Could you also publish the release on pypi? Thanks again for this wonderful project :)

Edit - looks like the CI failed because the version was not bumped in pyproject.toml

https://github.com/pwwang/python-varname/actions/runs/8945864362

Should we bump it all the way to 0.13.2 to ensure tag and release consistency?

[pwwang]

Haven't noticed the action failed. Should be on PYPI now.