Update README.md

Author: joepio

README.md

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 An implementation of Atomic Data for [Svelte](https://svelte.dev/).
 This library is still at an early stage and the API is subject to change.
 
+[See open source example project built with @tomic/svelte.](https://github.com/ontola/wonenatthepark)
+
 ## Quick Examples
 
 ### Getting a resource and displaying one of its properties