Add py.typed

[oittaa]

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[codecov-commenter]

Codecov Report

Merging #41 (0f5dfee) into main (f1f73d7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #41   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           65        65           
  Branches        10        10           
=========================================
  Hits            65        65           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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