manifest.json

{
"name": "The name of your application"
"src": "The URL that will be loaded when your app is launched",
"https://www.pwabuilder.com/assets/icons/icon_512.png",
        "sizes": "512x512",
        "type": "image/png",
        "purpose": "maskable"
    },
    {
        "src": "https://www.pwabuilder.com/assets/icons/icon_192.png",
        "sizes": "192x192",
        "type": "image/png",
        "purpose": "any"
    }

"screenshots": [
    {
        "src": "https://www.pwabuilder.com/assets/screenshots/screen1.png",
        "sizes": "2880x1800",
        "type": "image/png",
        "description": "A screenshot of the home page"
    }
],
"related_applications": [
    {
        "platform":"windows",
        "url": " The URL to your app in that app store"
    }
],
"prefer_related_applications": false,
"shortcuts": [
    {
        "name":"The name you would like to be displayed for your shortcut",
        "url":"The url you would like to open when the user chooses this shortcut. This must be a URL local to your PWA. For example: If my start_url is /, this URL must be something like /shortcut",
        "description":"A description of the functionality of this shortcut"
    }
]