I want to render Custom Image for finished and numbers for current and not finished.

It would be nice to include some documentation for the MultiProgressViewDataSource protocol.

Is your feature request related to a problem? Please describe.
This will be very helpful for those new to this library such that they do not need to comb through the example code provided.

Describe the solution you'd like
It would be great if the documentation can be formatted with Swift

I don't want to maintain a manual copy of the docs forever, but there are certain things I need before it's worth automating it:

• GitHub Actions, so that I can automatically generate docs when a new Git tag is created. Yes, I could use Travis now, but I don't want to.
• Jazzy / Swift support for showing default arguments. I think this will be supported in Swift 5, and Jazzy could then

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

I would like to be able to transform data using the File class or python objects.

Describe the solution you'd like

It would be interesting to be able to read a .txt file for example and