constructor() {
    super();

    // set initial state
    this.state = {
      runShowTitleAnimation : false,
    }

    // bind `this` to functions
    this._onBackgroundPhotoLoadEnd = this._onBackgroundPhotoLoadEnd.bind(this);
    this._onTitleClicked = this._onTitleClicked.bind(this);
  }
Set all the images and assets required in this scene.