Added Dialog for NewGame

Created a dialog GUI for creating a new game
Changed method from "main" to "show"

Changed the name of the method “main” to “show”
Gets rid of arguments and renamed

String[] args was unnecessary, and the method couldn't be called show
because there was another method in JDialog called the same thing.
dbeckwith
Merge pull request #4 from dbeckwith/NewGameDialog

Added Dialog for NewGame