Add support for leisure=schoolyard (Resolves #578)

[ashree2118]

Description, Motivation & Context

added a dedicated preset for leisure=schoolyard. This tag is widely used to identify outdoor areas belonging to schools, that are distinct from general parks.

Related issues

Closes #578

Links and data

(https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dschoolyard)

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Relevant tag usage stats:

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## Test-Documentation

### Preview links & Sidebar Screenshots

<!-- Use the preview to find examples, select the feature in question and **copy this link here**.
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<!-- FYI: What we will check:
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### Wording

- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
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[ashree2118]

Test-Documentation

Preview links & Sidebar Screenshots

Test confirming the new leisure=schoolyard preset is available.

1. Schoolyard preset:

Wording

• American English
• name, aliases (if present) use Title Case
• terms (if present) use lower case, sorted A-Z

[matkoniecz]

bad icon, schoolyard may be without any infrastructure

this icon represents rather playground

[ashree2118]

these are some icons i found

maki-playground

can do temaki-school but it doesnot feel like a yard or ground too