manifest.json

{
    "name": "FireChat",
    "short_name": "FireChat",
    "start_url": "/index.html",
    "display": "standalone",
    "orientation": "portrait",
	"background_color": "#fff",
	"theme_color": "aliceblue",
	"description": "Chat application build with firebase.",
	"icons": [{
    "src": "images/icons/icon-128x128.png",
      "sizes": "128x128",
      "type": "image/png"
    }, {
      "src": "images/icons/icon-144x144.png",
      "sizes": "144x144",
      "type": "image/png"
    }, {
      "src": "images/icons/icon-152x152.png",
      "sizes": "152x152",
      "type": "image/png"
    }, {
      "src": "images/icons/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    }, {
      "src": "images/icons/icon-256x256.png",
      "sizes": "256x256",
      "type": "image/png"
    }],
	"related_applications": [{
		"platform": "web",
		"url": "https://rishinc.com/firebase"
	}]
}