manifest.webmanifest

{
    "name": "whiteboard",
    "short_name": "whiteboard",
    "description": "whiteboard",
    "icons": [
        {
            "src": "img/icons/icon-32.png",
            "sizes": "32x32",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-64.png",
            "sizes": "64x64",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-128.png",
            "sizes": "128x128",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-256.png",
            "sizes": "256x256",
            "type": "image/png"
        }
    ],
    "start_url": "index.html",
    "display": "standalone",
    "theme_color": "#eeeeee",
    "background_color": "#ffffff"
}