Make a basic computer opponent

[edkim]

Requirements

User Interface:

• Upon starting a new Game, user should be prompted for Single Player or Two Player Game
• If Single Player Game, ask user if they want 1st Move or 2nd Move

Computer AI:

• Computer opponent will always make a valid move
• Computer opponent's move can be totally random so long as it's valid, but will always make a winning move if there is one available
• Bonus Points if your computer AI can beat 2 out of 3 five year olds