How do I turn my website into an app when adding to homescreen on an ios device?

I have a website and I would like for it to be an app, take as an example the samsung itest which prompts you to add to the home screen on an ios device, how would I implement such a thing and then make it work as a fullscreen app?

My current problem is that when I add it to the home screen it just opens safari with the website.

The device I am trying this on is a test iPhone 11 Pro Max with iOS 15.

Do I need some special tools or xCode for this? Can I do it without a MacOS device or do I need one?

Thanks in advance.