add algebraic petri model for scenario 2

[ChrisRackauckas]

@olynch @p-stokes

[codecov[bot]]

Codecov Report

Merging #92 (8138648) into main (9faea6a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #92   +/-   ##
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  Coverage   72.16%   72.16%           
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  Files           5        5           
  Lines         212      212           
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  Hits          153      153           
  Misses         59       59           

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[Vaibhavdixit02]

Should this be used instead of the SEIRHD model being used in #98 currently?

[ChrisRackauckas]

don't worry about it

[ChrisRackauckas]

Superceded by https://github.com/SciML/EasyModelAnalysis.jl/pull/101