{   "short_name": "React App",
   "name": "Create React App Sample",
      "icons": [{ "src": "favicon.ico",
             "sizes": "64x64 32x32 24x24 16x16",       
             "type": "image/x-icon"     },     {       "src": "logo192.png",       "type": "image/png",       "sizes": "192x192"     },     {       "src": "logo512.png",       "type": "image/png",       "sizes": "512x512"     }   ],   "start_url": ".",   "display": "standalone",   "theme_color": "#000000",   "background_color": "#ffffff" }