manifest.json

{
  "name": "Webstart",
  "short_name": "webstart",
  "description": "Lorem Ipsum is simply",
  "lang": "pt-BR",
  "theme_color": "#333333",
  "background_color": "#333333",
  "start_url": "/?src=pwa",
  "display": "standalone",
  "scope": "/",
  "screenshots": [
    {
      "src": "/img/screenshot1.png",
      "type": "image/png",
      "sizes": "540x720",
      "form_factor": "narrow"
    },
    {
      "src": "/img/screenshot2.jpg",
      "type": "image/jpg",
      "sizes": "720x540",
      "form_factor": "wide"
    }
  ],
  "icons": [
    {
    "src": "img/icon-128.png",
      "sizes": "128x128",
      "type": "image/png"
    },
    {
      "src": "img/icon-152.png",
      "sizes": "152x152",
      "type": "image/png"
    },
    {
      "src": "img/icon-192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "img/icon-256.png",
      "sizes": "256x256",
      "type": "image/png"
    }
  ]
}