function preload ()
{
    this.load.image('sky', './assets/sky.png');
    this.load.image('ground', './assets/platform.png');
    this.load.image('star', './assets/star.png');
    this.load.image('bomb', './assets/bomb.png');
    this.load.spritesheet('dude',
        './assets/dude.png',
        { frameWidth: 32, frameHeight: 48 }
    );
}

function create ()
{
    this.add.image(400, 300, 'sky');
    this.add.image(400, 300, 'star');
}