refactor OutputSystem

app/src/main/java/chess/SwingMain.java

@@ -0,0 +1,21 @@
+package chess;
+
+import chess.controller.CommandExecutor;
+import chess.controller.commands.NewGameCommand;
+import chess.model.ChessBoard;
+import chess.model.Game;
+import chess.view.simplerender.Window;
+
+public class SwingMain {
+	public static void main(String[] args) {
+        CommandExecutor commandExecutor = new CommandExecutor();
+
+        Game game = new Game(new ChessBoard());
+        Window window = new Window(commandExecutor);
+
+        commandExecutor.setGame(game);
+        commandExecutor.addListener(window);
+
+        commandExecutor.executeCommand(new NewGameCommand());
+    }
+}