Add citation bibliography

[LasNikas]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.90%. Comparing base (33f6f86) to head (5570c7d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #596   +/-   ##
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  Coverage   69.90%   69.90%           
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  Files          86       86           
  Lines        5123     5123           
=======================================
  Hits         3581     3581           
  Misses       1542     1542           

Flag	Coverage Δ
unit	69.90% <ø> (ø)

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[svchb]

https://github.com/trixi-framework/TrixiParticles.jl/blob/main/docs/Project.toml
you have to add DocumenterCitations here.

[efaulhaber]

Thanks for doing this! It's definitely a much more organized way to manage references.