add desktop server functions example

packages/server/examples/axum-desktop/src/client.rs

@@ -0,0 +1,13 @@
+// Run with:
+// ```bash
+// cargo run --bin client --features="desktop"
+// ```
+
+use axum_desktop::*;
+use dioxus_server::prelude::server_fn::set_server_url;
+
+fn main() {
+    // Set the url of the server where server functions are hosted.
+    set_server_url("http://localhost:8080");
+    dioxus_desktop::launch(app)
+}