feat: add axum example

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>

Cargo.toml

@@ -4,6 +4,7 @@ members = [
     "benches/alloc",
     "benches/micro",
     "benches/netbench",
+    "examples/axum",
     "examples/demo",
     "examples/fuse_test",
     "examples/hello_world",

examples/axum/Cargo.toml

+[package]
+name = "axum-example"
+edition = "2021"
+
+[dependencies]
+axum = "0.7"
+tokio = "1"
+
+[target.'cfg(target_os = "hermit")'.dependencies]
+hermit = { path = "../../hermit" }

examples/axum/src/main.rs

+use axum::routing::get;
+use axum::Router;
+#[cfg(target_os = "hermit")]
+use hermit as _;
+use tokio::{io, net};
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> io::Result<()> {
+	let app = Router::new().route("/", get(root));
+
+	let listener = net::TcpListener::bind("0.0.0.0:9975").await?;
+	axum::serve(listener, app).await?;
+
+	Ok(())
+}
+
+async fn root() -> &'static str {
+	"Hello, World!"
+}