manifest.json

{
    "name": "Tic Tac Toe",
    "short_name": "Tic Tac Toe",
    "theme_color": "#cb1717",
    "background_color": "#ff3939",
    "display": "standalone",
    "orientation": "portrait",
    "start_url": "/index.html",
    "icons": [
        {
            "src": "images/icon.png",
            "sizes": "128x128",
            "type": "image/png"
        },
        {
            "src": "images/icon.png",
            "sizes": "144x144",
            "type": "image/png"
        },
        {
            "src": "images/icon.png",
            "sizes": "152x152",
            "type": "image/png"
        },
        {
            "src": "images/icon.png",
            "sizes": "192x192",
            "type": "image/png"
        },
        {
            "src": "images/icon.png",
            "sizes": "512x512",
            "type": "image/png"
        }
    ]
}