Add "Web app installation"

[wuniversales]

For example, in this link, the option to install the web app appears in the browser.
https://meet.jit.si/
Why not add the option to install it to the project?

[1j01]

In some web browsers it's already installable, although it doesn't work offline.
Some web browsers require a service worker. See #109

[roeniss]

@1j01 Where could I find a button to download https://jspaint.app/ ? I tried chrome and firefox but never seen such a way. Am i missing something?

[1j01]

This isn't resolved, but I've closed this issue in favor of #109. You can follow that issue for updates.