feat(main): main function is async now

src/main.rs

@@ -9,7 +9,8 @@ mod view;
 use controller::*;
 use view::view::*;
 
-fn main() {
+#[tokio::main]
+async fn main() {
     let app: adw::Application = adw::Application::builder()
         .application_id("com.github.gtk-rs.examples.basic")
         .build();