Does this exist? Page Shortcut icon button.

I would like to add a button with text in my site footer near my social network buttons displaying an invite to site visitors to click to add my site's 'Page Shortcut' icon to their phone or pc desktop.
Is there an app or plugin or just some code  that exists to add this feature to my Debut theme Spotify site?
When I've manually added my site's 'Page Shortcut' to my phone desktop from my phone browser it uses my site favicon as the icon with my site name under.
Does anyone have ideas? thank you

mobile Barber and Massage Therapist serving between Hazelbrook and Lithgow NSW Australia.
Trying my best to create a cost effective and workable website on Shopify!