Creating the Manifest

{
  "name": "My Awesome App",
  "short_name": "AwesomeApp",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#fff",
  "description": "An awesome app doing awesome things",
  "icons": [{
    "src": "images/icon.png",
    "sizes": "192x192",
    "type": "image/png"
  }]
}