Implement documentation for statistics

[Domalar]

There is no documentation which explains what "G" "S" "C" in the statistics is. Also no explaination what "Verbesserung" is. How is it computed?

I can guess that "G" is total (so archived + session) and "S" is session. But I have no idea what C is?

What is the rule for Ao50 and Ao100?`

In Average the 3? Is this Mean of 3 oder some Ao3? and the 5 in the Average tab is this Ao5 or Mean of 5? Is this the best Ao5 or the average of the Ao5s?

An here is also this column with C???

Some kind of description in a help dialog or something like that would be nice.

[aricneto]

You can long-press any of the letters on the stat card to see what they mean, but I do agree that it's very unintuitive. If by "Verbesserung" you mean "Improvement", it's just an assorted collection of what I feel are the most relevant stats. A sort of "help" activity explaining each of the statistics would be nice, especially since I get so many people asking what deviation means every week.

[aricneto]

Also gonna reference #122 which has a similar problem

[exebook]

What is the deviation?