Write more thorough documentation for the ModelInfo class

[emprzy]

Label

documentation, docstring, good first issue

Priority Label

medium priority

Is your feature request related to a problem? Please describe.

There is a "TO DO" comment in the ModelInfo class definition (found in model_info.py) calling for better documentation. ModelInfo object instantiation is an important piece of a flepiMoP run, so it's optimal for us to thoroughly outline its attributes.

Is your feature request related to a new application, scenario round, pathogen? Please describe.

N/A

Describe the solution you'd like

Write docstring documentation for ModelInfo class defined in model_info.py generally consistent with these conventions.