[IDEA] Adding progress info

[Tuxified]

Perhaps nice to give folks an indication of how far in the exercises they are, like 2 out of 9 exercises completed. In case people are time-limited this may give them pointers of how much they can complete.

[gausby]

There is the list exerises command, but ofc we could write "exercise x out of y" in places where it makes sense 👍