Make flowcharts for how the code works

[samueldmcdermott]

This is a simple flowchar that shows, inputs, dophysics, and outputs?

There's a start for the flowchart (credit: Humna) https://docs.google.com/presentation/d/1-gDIkdLtom0yEvgFSj0C8N1egvZOjfOjp9rjqfLfI6U/edit#slide=id.g22c7a309c7b_0_206

Should we use lucidchart?

[samueldmcdermott]

subsumes #2

[cavestruz]

• [x] Translate Humna's image to an exported pdf and put into the paper.

[samueldmcdermott]

downloaded it as a png and it is now in the joss-paper branch in the paper folder