GameOver method now functional.
- Created rectangle object as "Win area" and checked if yoshi intersects this rectangle
- Pops out JFrame instead of JPanel (I found it easier) that will display game over message and whether you won or lost.
Added game over and game win functionality
- Created a rectangle object called winArea to see if yoshi intersects it. If true, then game win.
- Pops a JFrame insteads of putting up a JPanel (I found it easier)