[Tagging] Apps of delivery

[santamariense]

> delivery_contact might be better.

Or simply delivery:<appname>=* . Searching in taginfo there are
already 27 uses for the tag delivery:deliveroo [1], but with the value
"yes" and not the link.

On the other hand there is also one use for contact:deliveroo=weblink [4]

> What about multiple delivery companies from one poi/restaurant?

Yeah, for this reason I've suggested the suffix *:<appname>=*

And this situation seems to be common. E.g., for the same POI: [2] and [3]

> Maintainability of the tag might be an issue - how often does the
> delivery supplier change? In my area there are at least 3 delivery
> suppliers all competing for business.

In here delivery suppliers don't seem to have exclusivity in POI's
deliveries. So naturally there are some of them working with the same
POI.

*:<appname>=* can avoid problems with many suppliers

[1] - https://taginfo.openstreetmap.org/keys/delivery%3Adeliveroo
[2] - https://www.ifood.com.br/delivery/santa-maria-rs/camobi-pizza-camobi/cd4983de-4ba3-4f00-8946-35a52884722b
[3] - https://www.deliverymuch.com.br/dm/santa-maria-rs/camobi-pizza-p7wk7
[4] - https://taginfo.openstreetmap.org/keys/contact%3Adeliveroo