docs: Add use citation for Artificial Proto-Modelling paper

[matthewfeickert]

Description

Resolves #1346

Add use citation from Artificial Proto-Modelling: Building Precursors of a Next Standard Model from Simplified Model Results by @WolfgangWaltenberger, @andlessa, and @sabinekraml 🚀

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• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

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* Add use citation from 'Artificial Proto-Modelling: Building Precursors of a Next Standard Model from Simplified Model Results'
   - c.f. https://inspirehep.net/literature/1837822

[codecov]

Codecov Report

Merging #1347 (bd0493d) into master (11e4189) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1347   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files          63       63           
  Lines        3768     3768           
  Branches      538      538           
=======================================
  Hits         3674     3674           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
unittests	97.50% <ø> (ø)

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