{
  "name": "Your App Name",
  "short_name": "App",
  "description": "Your app description",
  "start_url": ".",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#ffffff",
  "icons": [
    {
      "src": "y48.png",
      "sizes": "48x48",
      "type": "image/png"
    },
    {
      "src": "y64.png",
      "sizes": "64x64",
      "type": "image/png"
    },
    {
      "src": "y180.png",
      "sizes": "180x180",
      "type": "image/png"
    },
    {
      "src": "y256.png",
      "sizes": "256x256",
      "type": "image/png"
    },
    {
      "src": "y512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ]
}