Resetting the game

We want to give the user the opportunity to start a new game, and we can do that by adding a reset function to the file. This function will reset the sliders to 0 and generate another random target color for the middle target circle.

Add the following function underneath the calculateScore function:

 //MARK: - RESET THE GAME
    func reset() {
        redTarget = Double.random(in: 0..<1)
        greenTarget = Double.random(in: 0..<1)
        blueTarget = Double.random(in: 0..<1)
        redGuess = 0.0
        greenGuess = 0.0
        blueGuess = 0.0
    }

This function creates new random colors and stores them in the Target variables. It also resets the Guess variables back...