Calculate and display Words Per Minute (WPM)

[darakhshanda]

User story

As a user, I want to see my typing speed calculated in Words Per Minute (WPM) when I finish typing so that I know my typing performance.

Acceptance Criteria:

[ ] WPM is calculated based on the number of correctly typed words and elapsed time.
[ ] The difficulty level and WPM result is displayed immediately after completing the test.
Tasks:

[ ] Create a results area to display the level, time and Words Per Minute (WPM) results to the user
[ ] Implement functionality to calculate the number of correctly typed WPM.
[ ] Display the WPM result with the level and time immediately after the user completes the test.