Add hosting instructions for Shuttle (#334)

* Add hosting instructions for Shuttle

* move shuttle sample code to examples dir

---------

Co-authored-by: Rob Ede <robjtede@icloud.com>

examples/shuttle/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "shuttle"
+version = "1.0.0"
+edition = "2021"
+
+# <shuttle-deps>
+[dependencies]
+actix-web = "4"
+shuttle-actix-web = "0.30"
+shuttle-runtime = "0.30"
+tokio = "1"
+# </shuttle-deps>

examples/shuttle/src/main.rs

@@ -0,0 +1,19 @@
+#[get("/")]
+async fn hello_world() -> impl actix_web::Responder {
+    "hello world"
+}
+
+// <shuttle-hello-world>
+use actix_web::{get, web::ServiceConfig};
+use shuttle_actix_web::ShuttleActixWeb;
+
+#[shuttle_runtime::main]
+async fn main() -> ShuttleActixWeb<impl FnOnce(&mut ServiceConfig) + Send + Clone + 'static> {
+    let config = move |cfg: &mut ServiceConfig| {
+        // set up your service here, e.g.:
+        cfg.service(hello_world);
+    };
+
+    Ok(config.into())
+}
+// </shuttle-hello-world>