Working with manifest files
A manifest file provides information about an app in JSON format. It is usually in the root folder of an application. The following code snippet shows how to add a manifest file named manifest.json to the index.html file:
<link href="manifest.json" rel="manifest" />
Here is a sample manifest file that includes many possible fields:
{
  "dir": "ltr",
  "lang": "en",
  "name": " 5-Day Weather Forecast",
  "short_name": "Weather",
  "scope": "/",
  "display": "standalone",
  "start_url": "./",
  "background_color": "transparent",
  "theme_color": "transparent",
  "description": "This is a 5-day weather forecast.",
  "...
