manifest.json

{
    "name": "Battery Info",
    "short_name": "Ba3 Info",
    "icons": [
        {
			"src": "/assets/img/icons/app-icon-16x16.png",
			"type": "image/png",
			"sizes": "16x16"
        },
        {
			"src": "/assets/img/icons/app-icon-24x24.png",
			"type": "image/png",
			"sizes": "24x24"
        },
        {
			"src": "/assets/img/icons/app-icon-32x32.png",
			"type": "image/png",
			"sizes": "32x32"
        },
        {
			"src": "/assets/img/icons/app-icon-64x64.png",
			"type": "image/png",
			"sizes": "64x64"
        },
        {
			"src": "/assets/img/icons/app-icon-128x128.png",
			"type": "image/png",
			"sizes": "128x128"
        },
        {
			"src": "/assets/img/icons/app-icon-256x256.png",
			"type": "image/png",
			"sizes": "256x256"
        },
        {
			"src": "/assets/img/icons/app-icon-512x512.png",
			"type": "image/png",
			"sizes": "512x512"
		}
    ],
    "start_url": "/index.html",
    "scope": ".",
    "display": "standalone",
    "orientation": "portrait",
    "background_color": "#fff",
	"theme_color": "#3f51b5",
	"description": "A PWA that displays information about user battery",
	"dir": "ltr",
	"lang": "en-GB"
}