manifest.json

{
    "name": "Task Planner",
    "short_name": "TaskPlanner",
    "icons": [{
        "src": "images/icons/ic_assignment_black_48dp-128x128.png",
        "sizes": "128x128",
        "type": "image/png"
    }, {
        "src": "images/icons/ic_assignment_black_48dp-144x144.png",
        "sizes": "144x144",
        "type": "image/png"
    }, {
        "src": "images/icons/ic_assignment_black_48dp-152x152.png",
        "sizes": "152x152",
        "type": "image/png"
    }, {
        "src": "images/icons/ic_assignment_black_48dp-192x192.png",
        "sizes": "192x192",
        "type": "image/png"
    }, {
        "src": "images/icons/ic_assignment_black_48dp-256x256.png",
        "sizes": "256x256",
        "type": "image/png"
    }],
    "start_url": "/index.html",
    "display": "standalone",
    "background_color": "#80BA26",
    "theme_color": "#80BA26",
    "gcm_sender_id": "PUT YOUR GOOGLE API PROJECT NUMBER IN HERE"
}