Update README.md

This was my submission for an Advanced Java class wherein we were directed to create "a game".  I've grown a bit fond of it and will hopefully will continue to develop it into a full game [with non-appropriated graphics and music!].

Image/music sources:
Map tiles - Mack's tilesets
Player sprites - Lady Sia, TDK Mediactive
Mob sprites - Disgaea, Atlus USA
Music - Odin Sphere, Atlus USA; Tanner Helland, http://www.tannerhelland.com/music-directory/