What is it?
Why is it required
Though service workers are not yet supported on Safari, we can still achieve a lot using HTML5 application cache and localStorage. And Safari does support launching your application in a full screen mode using just a meta-tag. (Refer Safari meta-tags to know more).
This is a feature chrome has recently released where it checks that if your web app is using service workers and shows a banner to install the application to the home screen. Official blog by Google
I believe that this is a really cool feature to have and I thought of bringing the same feature to the iOS devices.
Screenshots and Demo
Working demo of the plugin: http://rahulgaba.com/iPhone-install-overlay