Add action sound effects

[tagniam]

The game would be a lot more fun with audio. In-game sound effects will be needed when the player AND enemy does the following:

• Attack
• Risk Attack
• Heal

Make sure to credit where you get the sound effects from in the source code and in the readme!

[kevinmmurphy]

Can I give this one a try, may take a little longer than the last?

[tagniam]

Sure.