{ 
            "name": "STEEL",
            "short_name": "STEEL",
            "start_url": "/",
            "theme_color": "#000000",
            "background_color": "#ffffff",
            "display": "standalone",
            "gcm_sender_id": "103953800507",
            "version": "1.3.0",
            "icons": [
                {
                    "src": "https://appy.vanigliapro.it/img/steel_ICONA.png",
                    "sizes": "192x192",
                    "type": "image/png"
                },
                {
                    "src": "https://appy.vanigliapro.it/img/steel_ICONA.png",
                    "sizes": "256x256",
                    "type": "image/png"
                },
                {
                    "src": "https://appy.vanigliapro.it/img/steel_ICONA.png",
                    "sizes": "384x384",
                    "type": "image/png"
                },
                {
                    "src": "https://appy.vanigliapro.it/img/steel_ICONA.png",
                    "sizes": "512x512",
                    "type": "image/png"
                } 
            ]
        }