Add Finished button

[johnrearden]

As a player, I can click on the Finish button, so that I can stop the clock and see how much of the crossword I have correct

Acceptance criteria:

• Finished button, with confirm button, available to the player
• Finish button displays completed crossword, with letter missing and letters incorrect highlighted in 2 different colours
• Player is prompted for profile upon first click of the button.

Tasks: