{
    "name": "PWA sample",
    "short_name": "PWA",
    "icons": [{
    "src": "./image/icon81x81.png",
    "sizes": "81x81",
    "type": "image/png"
    },{
    "src": "./image/icon180x180.png",
    "sizes": "180x180",
    "type": "image/png"
    },{
    "src": "./image/icon192x192.png",
    "sizes": "192x192",
    "type": "image/png"
    },{
    "src": "./image/icon512x512.png",
    "sizes": "512x512",
    "type": "image/png"
    }
    ],
    "theme_color": "#c0c0c0",
    "background_color": "#dcdcdc",
    "display": "standalone",
    "start_url": "./index.html"
    }