>>> hi, write a simple kotlin native program demonstrating usage of the ktor library 
<think>
Okay, I need to help the user by writing a simple Kotlin program using the Ktor library. Let me start 
by recalling what Ktor is. It's a framework for building server-side applications with Kotlin, and 
it's designed to make web applications easier to develop.

The user wants something basic but demonstrates usage. So maybe a "Hello World" application would 
work. But in a server context, perhaps an endpoint that returns "Hello World" when accessed.

First, I should set up the project structure. Using Maven or Gradle is common for dependencies. Since 
Ktor is part of JetBrains tools, I'll assume they're using IntelliJ IDEA with Ktor plugin installed.

Next, the main class needs to be a function in a module. That's the entry point for Ktor 
applications. So creating a `main` function that uses Ktor's `io.ktor.application` as an application 
instance.

I need to structure the routes. The simplest route is a `GET` request to `/hello`. Using Ktor's 
`route` method, I can define this endpoint and have it return a response when accessed.

For the response, using HTML with embedded CSS is simple. So returning a `html` content type and a 
body that displays "Hello World!".

Now, putting all together: set up the dependencies in `build.gradle`, create the module class, write 
the main function with the route, and test it via Maven or Gradle.

Wait, do I need to include any specific Ktor version? Probably not; the latest should work. Also, 
make sure the project structure is correct with a `main/kotlin` directory and the module file there.

Finally, when the user runs the application, accessing `http://localhost:8080/hello` should display 
the message. That should fulfill the requirement of a simple demonstration.
</think>

Here's a simple example of using Ktor to create a "Hello World" server in Kotlin:

```kotlin
import io.ktor.application.*
import io.ktor.http.*

fun main() {
    val app: Application = io.ktor.application.create()
    val routes = app.useContext()

    routes.route("/hello", "GET") { ctx ->
        ctx.respondWith(
            html {
                head { meta(charset = "utf-8") }
                body {
                    h1("Hello World!")
                }
            }
        )
    }

    io.ktor.server.certs.inMemory()
    val server = app.createServer()
    server.start()
}

@kotlinx.reflect.jvm.annotations.Generated
data class Module(
    @JvmField val application: Application = io.ktor.application.create()
)

@KtModule
class KtorHello : Module() {

    override fun intercept(vararg modules: Any, scope: Function<*, *>, _id: String) {
        super(interceptables)
    }

    companion object apply = Apply(KtorHello())
}
```

To run this program, you'll need to:

1. Create a `build.gradle` file:
```gradle
plugins {
    id("io.ktor") version "2.0.0"
}

repositories {
    mavenUrl("https://dl.comet.ml/ktor/versions/2.0.0-rc-1000/maven")
}
```

2. Save the code in a file named `main.kt` under your project's `src/main/kotlin` directory.

3. Run it with:

```bash
mvn io.ktor:ktor-node:2.0.0-rc-1000:jar
mvn klonet:1.5.3:jar
mvn app:app:jar
mvn compile
mvn run
```

When you access `http://localhost:8080/hello`, it will display "Hello World!" in your browser.

This is a basic example that demonstrates the usage of Ktor's routing and response capabilities to 
create a simple web server.