Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>

Author: nihaltp

src/main/java/com/mycmd/commands/TitleCommand.java

@@ -9,6 +9,8 @@ public void execute(String[] args, ShellContext context) {
         if (args.length > 0) {
             String title = String.join(" ", args);
             System.out.println("\033]0;" + title + "\007");
+        } else {
+            System.out.println("Usage: title <new title>");
         }
     }