Update library.json

[Circout-sudo]

What this changes

Added libraries in Germany(Kleinmachnow and Stahnsdorf) and one library in China(Yangzhou)

Type of change

• New public place(s)

Proof (required for new public places)

Fill this in for every place added in this PR. It stays in the PR, not in the
dataset.

Field	Value
Source or citation
Google Maps rating (must be >= 4.0)
Google Maps review count (must be >= 50)
Date verified

• Each place's rating is 4.0 or higher.
• Each place has 50 or more reviews.
• Coordinates point to the correct entrance.
• The JSON record stops at gmaps_link and added_by (no proof fields committed).

Checklist

• The site hosts no copyrighted files; resource and paper changes are links only.
• No em dashes in any copy.

[vercel]

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