Add Playground Map preset

[1ec5]

playground=map should have a preset named Playground Map. As of writing, playground=map is one of the most widely used documented playground=* tags that doesn’t have an iD preset yet, with several less common tags already being supported. The Subject and Surface fields would both be relevant.

[tyrasd]

it's probably tricky to find a good name for this preset. Initially, I thought a "playground map" would be a (sign containing a) map of a playground. 🙊 Do you have an idea how we could name this accurately?

[tyrasd]

PS: This could also be a candidate for a subject:wikidata field (see #533)

[arch0345]

it's probably tricky to find a good name for this preset. Initially, I thought a "playground map" would be a (sign containing a) map of a playground. 🙊 Do you have an idea how we could name this accurately?

I named this "Painted Playground Map" in #543