Missing `py.typed` file in package

[tusharsadhwani]

Currently trying to pip install trycast and doing import trycast causes mypy to raise an error for the package:

$ cat asd.py
import trycast

$ mypy asd.py
asd.py:1: error: Cannot find implementation or library stub for module named "trycast"  [import-not-found]
asd.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 1 source file)

This is because type checked packages require to ship as a package, containing a blank py.typed file as per PEP 561.