(server) feat:Add command helper

Server/src/command_helper.rs

@@ -0,0 +1,22 @@
+use std::io::Write;
+
+pub(crate) fn run() {
+    let stdin = std::io::stdin();
+
+    loop {
+        print!("> ");
+        std::io::stdout()
+            .flush()
+            .expect("Failed to flush standard output!");
+
+        let mut input = String::new();
+        stdin
+            .read_line(&mut input)
+            .expect("Failed to read from standard input!");
+
+        match input.trim() {
+            "exit" => break,
+            _ => println!("Usage: <command>"),
+        }
+    }
+}