Documentation: how are sets prioritized when priority usernames are not set?

[samszotkowski]

Is your feature request related to a problem? Please describe.
Documentation does not describe default sorting behavior when exclude_usernames, only_priority_usernames, or priority_usernames are not set.

Describe the solution you'd like
I'd like to know how it describes which sets to grab. Does it sort by most downloads descending?

Describe alternatives you've considered
I'll read through the code

Additional context
Add any other context or screenshots about the feature request here.

[Buried-In-Code]

Documentation on this project has been a little lacking. The current setup uses webscraping so the ordering is determined by the default on the Mediux page, which is "Most Downloads". Aside from the ordering of names in priority_usernames, all other pulls use that ordering.

Mediux is working on an API (see #35) to be able to pull the set information without scraping, and with that I might be able to make the ordering configurable