Create a stats module to keep track of a user's practice stats

Created by: milindvishnoi

Overview

We'll create a StatsModule that deals with the logic and storage of user stats. This module can be be used from across the app.

The Stats module will take care of:

• Percentage Of Correct Questions #18 (closed)
• # of Questions answered #19 (closed)
• Time spent practicing #20 (closed)

Behaviour

When a user answers a question correctly, the stats module would behave as follows:

• For the MathConcept and the Total Stats:
  • Update the total count
  • Update the time spent
  • Update the correct count