Saving of the previous board in the array list (user touch)

Merge branch 'master' of
https://gitarero.ecam.fr/aurele.wittke/OOP_1A5_Project

src/backend/Board.java

@@ -282,6 +282,7 @@ public class Board {
 				this.x=-1;
 				this.y=-1;
 				castlingDone=false;
+				previousBoard.add(this.toString());
 				// we add 1 to the number of turned played
 			}
 		}