Add Counters, Stats (% completion, etc)

Hi, I've found myself counting items on my lists to know how many items I have on a list, or how much my progress is on a list of items.

I would like to see an option to see that information, something like this:

It can be a new optional setting.

I think this could be really useful.

I hope to see this in a future update of Workflowy.

Regards!