Add a simple WASM example

[Dexterp37]

This is a simple demo for the WASM version of STT, which does not require a bundler and fetches the WASM libstt directly from the latest Github release.

NPM is used to reduce the boilerplate by reusing an HTTP server and a file downloader\unzipper.

Note: npm download currently fails as the "1.4.0" is marked as pre-release.

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[reuben]

Awesome!