Add simple yew frontend

project/frontend/src/main.rs

@@ -0,0 +1,47 @@
+use yew::prelude::*;
+
+struct App {
+    clicked: bool,
+    onclick: Callback<ClickEvent>,
+}
+
+enum Msg {
+    Click,
+}
+
+impl Component for App {
+    type Message = Msg;
+    type Properties = ();
+
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        App {
+            clicked: false,
+            onclick: link.callback(|_| Msg::Click),
+        }
+    }
+
+    fn update(&mut self, msg: Self::Message) -> ShouldRender {
+        match msg {
+            Msg::Click => {
+                if self.clicked {
+                    self.clicked = false;
+                } else {
+                    self.clicked = true
+                }
+                true
+            }
+        }
+    }
+
+    fn view(&self) -> Html {
+        let button_text = if self.clicked { "Clicked!" } else { "Click me" };
+
+        html! {
+            <button onclick=&self.onclick>{ button_text }</button>
+        }
+    }
+}
+
+fn main() {
+    yew::start_app::<App>();
+}