feat: show progress messages on initialization, for reassurance

[wally-crunk]

When starting up, thousands of files can take a long time to read, and there's no screen output.

Suggested: a welcome message and progress indicator, so user knows the program started successfully and not hung on start.

[zakkarry]

I might be able to help with this, I recently was playing around with progress bars using the rich module.

Perhaps an indexing progress bar would give the feedback you were looking for?

If so, I will speak to @moleculekayak about any implementation details he might have in mind.