Create initial multiplayer server skeleton

rc_multiplayer/src/traits.rs

@@ -0,0 +1,7 @@
+pub type UserData = ();
+pub type PacketData = crate::handler::EventData;
+
+#[async_trait::async_trait]
+pub trait EventCodeHandler: Send + Sync {
+    async fn handle(&self, data: &bytes::Bytes, peer: &mut literustlib_server::Connection<PacketData>, user: &UserData, sender: &literustlib_server::DataSender<PacketData>);
+}