IOS Devices add website to homescreen as web app not shortcut

I am trying to find the correct way to code a similar site that would allow the user to add it to their homescreen. Then when opened it would open not as a shortcut to safari but as a web app of its own. You can see this in the fedex example below. You can see I have both safari and the web app open at one time. The web app has no address bar or safari navigation.

Please direct me to what this is called as I can not find information on how to achieve this on iOS