ENH: Add PyPI badge to README

[jhlegarreta]

Add PyPI badge to README.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.64%. Comparing base (ba1f12a) to head (e445fce).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   58.45%   58.64%   +0.19%     
==========================================
  Files          22       22              
  Lines        2094     2094              
  Branches      322      365      +43     
==========================================
+ Hits         1224     1228       +4     
+ Misses        787      782       -5     
- Partials       83       84       +1     

Flag	Coverage Δ
unittests	58.48% <ø> (+0.02%)	⬆️

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