Implement event on gateway

src/routes/gateway/events.rs

@@ -0,0 +1,8 @@
+use serde::Serialize;
+
+#[derive(Serialize)]
+pub struct GatewayEvent<T: Serialize> {
+    pub namespace: &'static str,
+    pub action: &'static str,
+    pub content: T,
+}