Create MVC folder structure

frontend/core/src/com/game/tankwars/controller/GameController.java

+package com.game.tankwars.controller;
+
+public class GameController {
+}

frontend/core/src/com/game/tankwars/model/Tank.java

+package com.game.tankwars.model;
+
+public class Tank {
+}

frontend/core/src/com/game/tankwars/view/GameView.java

+package com.game.tankwars.view;
+
+public class GameView {
+}