manifest.json

{
          "background_color": "#fff",
          "display": "standalone",
          "orientation":"portrait",
          "theme_color": "#fff",
          "short_name": "DOB Finder",
          "name": "Date of Birth Finder",
          "description": "description or purpose of your progressive web app",
          "lang": "en-US",
          "icons": [
          {
            "src": "img/icons/icon-72x72.png",
            "sizes": "72x72",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-96x96.png",
            "sizes": "96x96",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-128x128.png",
            "sizes": "128x128",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-144x144.png",
            "sizes": "144x144",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-152x152.png",
            "sizes": "152x152",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-192x192.png",
            "sizes": "192x192",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-384x384.png",
            "sizes": "384x384",
            "type": "image/png"
          },
          {
            "src": "img/icons/icon-512x512.png",
            "sizes": "512x512",
            "type": "image/png"
          }
          ],
          "start_url": "index.html?launcher=true",
          }