Start backend with rocket.rs

rs/src/main.rs

@@ -0,0 +1,20 @@
+#[macro_use]
+extern crate rocket;
+use rocket::serde::{json::Json, Serialize};
+
+#[derive(Serialize)]
+struct Greeting<'a> {
+    hello: &'a str,
+}
+
+#[get("/")]
+fn index() -> Json<Greeting<'static>> {
+    Json(Greeting {
+        hello: "Hello, world!",
+    })
+}
+
+#[launch]
+fn rocket() -> _ {
+    rocket::build().mount("/api/", routes![index])
+}