simpleInitApp

@Override
public void simpleInitApp() {
        treeApple = new EntityItem2D("tree.png", 0, 0, 40, -30);
        rootNode.attachChild(treeApple.getNode());
        grass = new EntityItem2D("plantlife.png", 0, 0, 15, -11);
        rootNode.attachChild(grass.getNode());
}