Readd shangy24 method in Staff

Staff.java

@@ -826,5 +826,15 @@ public class Staff {
                 "celsius picture"
         );    
     }
+
+    public Employee shangy24() {
+        return new Employee(
+            "Shangzhen Yang",
+            "Student",
+            "Hello, World!",
+            "your-name.jpg",
+            "Wallpaper of Movie Your Name"
+        );
+    }
 }