Add py.typed.

[dajiaji]

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[codecov]

Codecov Report

Merging #56 (8d77c9a) into main (31f52c9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   98.07%   98.07%           
=======================================
  Files          13       13           
  Lines        1145     1145           
  Branches      163      163           
=======================================
  Hits         1123     1123           
  Misses         19       19           
  Partials        3        3           

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