ASP.Net: Add shortcut to HomeScreen in Progressive Web App Android

Hi dharmendr.

Hope you are doing well. 

I have created a website using bootstrapped template and asp.net

I want to convert it to Progressive Web App (PWA) and use as an app on my mobile.

Are you able to make a button available to add a shortcut to Home screen?

I was following instructions on below link. But seems not working 

https://dev.to/developertharun/convert-any-website-into-a-pwa-in-just-3-simple-steps-35pp 

{
  "name": "Stick-it Notes by Tharun",
  "short_name": "Stick-it",
  "start_url": "index.html",
  "scope": "./",
  "icons": [
    {
      "src": "contract.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "contract.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "theme_color": "#ffd31d",
  "background_color": "#333",
  "display": "standalone"
}

Thanks & Regards,

Harinda