Add a simple example

[StefanOltmann]

I have a existing Kotlin Ktor Server in a Docker container.

Please add a simple example how a JavaScript index.js and wrangler.toml need to look like.

The example on the documentation page is outdated and samples here only use TypeScript and JSONC wrangler syntax.

[StefanOltmann]

I made one: https://github.com/StefanOltmann/kotlin-cloudflare-containers-sample