Housekeeping/pypistats badge

[CosmoMatt]

Just adds readme badge for PyPi download tracking.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.23%. Comparing base (165fa9a) to head (cddfd0a).
Report is 1 commits behind head on main.

❗ Current head cddfd0a differs from pull request most recent head 7ffd226

Please upload reports for the commit 7ffd226 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   91.23%   91.23%           
=======================================
  Files          12       12           
  Lines         365      365           
=======================================
  Hits          333      333           
  Misses         32       32           

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