[English] Ansyc load the texture

In loading scene you should use ansyc load the atlas and other resource.

void LoadingScene::onEnter(){

    // add background to current scene

    Sprite *background = Sprite::create("splash.png");

    Size visibleSize = Director::getInstance()->getVisibleSize();

    Point origin = Director::getInstance()->getVisibleOrigin();

    background->setPosition(origin.x + visibleSize.width/2, origin.y + visibleSize.height/2);

    this->addChild(background);

    // start ansyc method load the atlas.png

    Director::getInstance()->getTextureCache()->addImageAsync("GameAtlas.png", CC_CALLBACK_1(LoadingScene::loadingCallBack, this));

}

void LoadingScene::loadingCallBack(Texture2D *texture){

    

    auto plPath = FileUtils::getInstance()->fullPathForFilename("GameAtlas.plist");

    //auto plPath = "atlas/GameAtlas.plist";

    auto frameCache = SpriteFrameCache::getInstance();

    frameCache->addSpriteFramesWithFile(plPath, texture);

    // After loading the texture , preload all the sound

    SimpleAudioEngine::getInstance()->preloadEffect("audio1.ogg");

    // After load all the things, change the scene to new one

    auto scene = MainScene::create();

    TransitionScene *transition = TransitionFade::create(1, scene);

    Director::getInstance()->replaceScene(transition);

}