class documentation - a shitload of it

app/src/main/java/chess/controller/PlayerCommand.java

@@ -3,6 +3,9 @@ package chess.controller;
 import chess.controller.event.GameListener;
 import chess.model.Game;
 
+/**
+ * Abstract class, manage commands given by the player, which are the commands that can be undone.
+ */
 public abstract class PlayerCommand extends Command{
 
 	public CommandResult undo(Game game, GameListener outputSystem) {