Add CITATION.cff

[ffl096]

Closes #301.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.90%. Comparing base (c22b372) to head (45d692e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #432   +/-   ##
=======================================
  Coverage   97.90%   97.90%           
=======================================
  Files          40       40           
  Lines        3677     3677           
=======================================
  Hits         3600     3600           
  Misses         77       77           

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