feat: implement VehicleInspector utility

src/main/java/org/example/util/VehicleInspector.java

@@ -0,0 +1,21 @@
+package org.example.util;
+
+import org.example.model.*;
+
+/*
+ * Utility class to inspect vehicles.
+ * Demonstrates instanceof and polymorphism.
+ */
+
+public class VehicleInspector {
+
+    public static void inspect(Vehicle v) {
+
+        v.basicInfo();
+
+        // TODO:
+        // If ElectricCar → print "Check battery system"
+        // If SportsCar → print "Check brakes and performance"
+        // If GasCar → print "Check engine and oil"
+    }
+}