adds hello world, adds architecture doc

src/main.rs

@@ -0,0 +1,11 @@
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    let hello = warp::get()
+        .map(|| format!("Hello world!"));
+
+    warp::serve(hello)
+        .run(([127, 0, 0, 1], 5309))
+        .await;
+}