Pwa-module: Web app banners

[memic84]

What problem does this feature solve?

Support for iOS 11.3, where web app banners are not shown and partial PWA support. I think that we need some support for those browsers which don't support everything yet.

What does the proposed changes look like?

Detect if when the browser is on iOS, and show a install prompt for the PWA the second the the user visits.

_{This feature request is available on Nuxt community (#c48)}

[tetreault]

I think this issue is bigger than Nuxt, and actually related to iOS itself. We recently faced this issue in a client PWA outside of Nuxt.

[memic84]

I think so, this is the current lacking support from Apple. Close issue?

[manniL]

@memic84 Exactly. Apple doesn't support this by now :(

[tetreault]

I also recently found out that Apple didn't even implement WebRTC into PWA's (or anything that's a webview). It only works in Safari. Wish Apple wasn't so half-assed.

[pi0]

Added appreciate label :)