feat: add missing message handlers

src/message/server/privileged_users.rs

@@ -0,0 +1,19 @@
+use std::sync::mpsc::Sender;
+
+use crate::{
+    message::{Message, MessageHandler},
+    server::ServerOperation,
+};
+
+pub struct PrivilegedUsersHandler;
+
+impl MessageHandler for PrivilegedUsersHandler {
+    fn get_code(&self) -> u8 {
+        69
+    }
+
+    fn handle(&self, message: &mut Message, _sender: Sender<ServerOperation>) {
+        let number = message.read_int32();
+        println!("Number of privilaged users: {}", number);
+    }
+}