Add first version of CITATION.cff

[gipert]

@jasondet @iguinn please check your info. @MoritzNeuberger @gracesong312 @SamuelBorden please let me have your ORCID.

I used this page: https://github.com/legend-exp/legend-pydataobj/graphs/contributors to determine the author list and I did not include contributors of bug fixes or other minor things.

Let me know what do you think about this selection.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ae371f2) 72.91% compared to head (2f53d3c) 72.91%.

❗ Current head 2f53d3c differs from pull request most recent head 63a8305. Consider uploading reports for the commit 63a8305 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #64   +/-   ##
=======================================
  Coverage   72.91%   72.91%           
=======================================
  Files          29       29           
  Lines        2466     2466           
=======================================
  Hits         1798     1798           
  Misses        668      668           

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[jasondet]

looks good for me! Thanks Luigi!