So right after the if statement where we call the super Layer::init method, we add:

_players = Vector<GameSprite*>(2);
_player1Score = 0;
_player2Score = 0;
_screenSize = Director::getInstance()->getWinSize();

We create the vector where we'll store both players, initialize the score values, and grab the screen size from the singleton, all-knowing Director. We'll use the screen size to position all sprites relatively. Next we will create our first sprite. It is created with an image filename, which FileUtils will take care of loading from the correct folder:

auto court = Sprite::create("court.png");
court->setPosition(Vec2(_screenSize.width * 0.5, _screenSize.height * 0.5));
this->addChild(court);

Get into the habit of positioning sprites with relative values, and not absolute ones, so we can support more screen sizes. And say hello to...