Add citation for Gower et al. (2025) to README

[gregorgorjanc]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.81%. Comparing base (2470fb4) to head (f38d533).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1769   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files         142      142           
  Lines        4872     4872           
  Branches      472      472           
=======================================
  Hits         4863     4863           
  Misses          6        6           
  Partials        3        3           

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[petrelharp]

Good call, thanks!