{ 
  "short_name": "", 
  "name": "", 
  "icons": [{ 
    "src": "icon.png", 
    "type": "image/png", 
    "sizes": "192x192" 
  }], 
  "start_url": "/?utm_source=homescreen", 
   "background_color": "#fafafa", 
   "theme_color": "#fafafa" 
}