Complete One Iteration of the Game Loop

[gbroques]

It would be simpler only complete one iteration of the game loop first.

Start with an arbitrary position, for example 3.

1. Play 3 notes of the song.
2. Wait for the player to match those 3 notes.
3. Wait for Cozmo to match those 3 notes.

If either the player or Cozmo gets the sequence wrong, then exit the game.

The interaction for playing an incorrect note is taken care of by issue #7 and can be completed later.