Conceptual workflow for new contributors

[s-goldman]

I know that when I started contributing to the BEAST it was a challenge to understand how it worked through the code. I was thinking it may be useful to create a figure that shows how the code works through different the scripts and functions. If anyone knows how to do this programmatically, that might be easier. Manually someone may be able to do it with powerpoint of something?

(low effort but requires good understanding of the code)

[s-goldman]

Christina has pretty much done it [(https://github.com/BEAST-Fitting/beast-examples/pull/2)]