Add zenodo badge

[IAlibay]

Simple PR, just adding the zenodo badge.

WIll self-merge this one due to the innocuous change being added.

We should follow this up with a citation CFF file (see #457 )

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 98.52%. Comparing base (d472237) to head (22afe32).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #470   +/-   ##
=======================================
  Coverage   98.52%   98.52%           
=======================================
  Files          39       39           
  Lines        2168     2168           
=======================================
  Hits         2136     2136           
  Misses         32       32           

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