manifest.json

{
  "short_name": "Twittor",
  "name": "Twittor for heroes",
  "start_url": "index.html",
  "background_color": "#3498db",
  "theme_color": "#3498db",
  "display": "standalone",
  "orientation": "portrait",
  "icons": [
    {
        "src": "img/icons/icon-72x72.png",
        "type": "image/png",
        "sizes": "72x72"
    },
    {
        "src": "img/icons/icon-96x96.png",
        "type": "image/png",
        "sizes": "96x96"
    },
    {
        "src": "img/icons/icon-128x128.png",
        "type": "image/png",
        "sizes": "128x128"
    },
    {
        "src": "img/icons/icon-144x144.png",
        "type": "image/png",
        "sizes": "144x144"
    },
    {
        "src": "img/icons/icon-152x152.png",
        "type": "image/png",
        "sizes": "152x152"
    },
    {
        "src": "img/icons/icon-192x192.png",
        "type": "image/png",
        "sizes": "192x192"
    },
    {
        "src": "img/icons/icon-384x384.png",
        "type": "image/png",
        "sizes": "384x384"
    },
    {
        "src": "img/icons/icon-512x512.png",
        "type": "image/png",
        "sizes": "512x512"
    },
    {
      "src": "img/icons-ios/apple-launch-640x1136.png",
      "type": "image/png",
      "sizes": "640x1136"
    },
    {
      "src": "img/icons-ios/apple-launch-750x1334.png",
      "type": "image/png",
      "sizes": "750x1334"
    },
    {
      "src": "img/icons-ios/apple-launch-1125x2436.png",
      "type": "image/png",
      "sizes": "1125x2436"
    },
    {
      "src": "img/icons-ios/apple-launch-1242x2208.png",
      "type": "image/png",
      "sizes": "1242x2208"
    }
  ]
}