Add Zenodo link to the readme

[jthorton]

Checklist

• Added a news entry

Fixes #76 by adding a link to zenodo

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.53%. Comparing base (b27eabd) to head (6f0f88a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files          13       13           
  Lines         649      649           
=======================================
  Hits          633      633           
  Misses         16       16           

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