Hint for score parameters

[vahida1157]

I think it's very important to add feature for new player to know what each parameter of score is.
For example, I don't know yet about logic of "streak" score. also, I don't know how I can reach more scores (like 100% accuracy)
So, it's important to create a section or a page for score parameters and describe all of them and also you can add tooltip on score parameters that shows when test done.