manifest.json

{
   "name": "Todo's App",
   "short_name": "Todo's",
   "start_url": "/index.html",
   "display": "standalone",
   "background_color": "#42a5f5",
   "theme_color": "#42a5f5",
   "orientation": "portrait-primary",
   "icons": [
      {
         "src": "/img/icons/72.png",
         "type": "image/png",
         "sizes": "72x72"
      },
      {
         "src": "/img/icons/96.png",
         "type": "image/png",
         "sizes": "96x96"
      },
      {
         "src": "/img/icons/128.png",
         "type": "image/png",
         "sizes": "128x128"
      },
      {
         "src": "/img/icons/144.png",
         "type": "image/png",
         "sizes": "144x144"
      },
      {
         "src": "/img/icons/152.png",
         "type": "image/png",
         "sizes": "152x152"
      },
      {
         "src": "/img/icons/192.png",
         "type": "image/png",
         "sizes": "192x192"
      },
      {
         "src": "/img/icons/384.png",
         "type": "image/png",
         "sizes": "384x384"
      },
      {
         "src": "/img/icons/512.png",
         "type": "image/png",
         "sizes": "512x512"
      }
   ]
}