Example App

[riverKanies]

Describe the enhancement

It'd be great to have a minimal example app using bdk-wasm in the browser included in this lib. A ReactNative example would also be great actually.
This would also mean we wouldn't need to include that in the book-of-bdk, which would be a good thing since the bdk team probably wouldn't merge that until this repo gets taken under the bdk org (which could be a while)

Use case

Additional context