Add citation file and PR template

[agdestein]

This adds a CITATION.cff file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.39%. Comparing base (ad8c8f3) to head (7593bdf).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   57.39%   57.39%           
=======================================
  Files          29       29           
  Lines        3666     3666           
=======================================
  Hits         2104     2104           
  Misses       1562     1562           

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