Create py.typed

[c0m4r]

Proposed changes

Add an empty py.typed file to comply with https://mypy.readthedocs.io/en/latest/installed_packages.html#creating-pep-561-compatible-packages

test.py:11: error: Skipping analyzing "crossplane": module is installed, but missing library stubs or py.typed marker  [import-untyped]
test.py:11: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 1 source file)

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork