Update DataStorage.cs

Made previously public variables; gridArray and currGrid to private. Added Getters and Setters to those variables.
Update Nim.cs

small change: turn accepts currGrid's getter.
Update AI.cs

Updated loop
Update Nim.cs and Grid.cs
added document
update files

deleted the interface, change the player, nim and grid class
Update MainMenu.cs

Invalid input added
Update Player.cs

updating variable names; random, move, and string array variables.
Update Player.cs

Missed a few changes: Removed boolean and string array.