chore: Add CITATION.cff

[effigies]

I propose me, @ubdbra001 and @rwblair as primary authors of the new validator, and other contributors with only a couple commits affecting the regex validator class in alphabetical order.

@olgn, @sappelhoff, @Remi-Gau @DimitriPapadopoulos you are included as authors. Feel free to update your entry or request to be removed.

@MaxvandenBoom @kabilar We didn't have your entries in the JS CITATION.cff. Would you like to be included as authors? You might want to add yourself on the JS repository as well.

The current list was determined by git log. Anybody else who feels they've contributed to the Python validator in some capacity other than code, please let me know.

Closes #45.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.89%. Comparing base (2268770) to head (f48d757).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files          13       13           
  Lines         846      846           
  Branches      124      124           
=======================================
  Hits          769      769           
  Misses         47       47           
  Partials       30       30           

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[kabilar]

@MaxvandenBoom @kabilar We didn't have your entries in the JS CITATION.cff. Would you like to be included as authors? You might want to add yourself on the JS repository as well.

@effigies Thank you for including me. I have added my information above.