Modeline example

Hi and thanks for this package.

Could you please add an example configuration for the modeline in addition to eshell?

I see there's a shrink-path-file-mixed function which is meant to be used in the modeline, but I can't figure out how. I see it's used in doom-modeline but that's too complicated, I can't find a simple example https://github.com/seagle0128/doom-modeline/blob/master/doom-modeline.el#L421

Thanks!