DOC: Add PyPI badge to README

[jhlegarreta]

Changes proposed in this pull request

Add PyPI badge to README.

Documentation that should be reviewed

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.83%. Comparing base (004e248) to head (bb43e92).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #101   +/-   ##
=======================================
  Coverage   78.83%   78.83%           
=======================================
  Files          80       80           
  Lines        5868     5868           
  Branches      591      591           
=======================================
  Hits         4626     4626           
  Misses       1089     1089           
  Partials      153      153           

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