feat: add SportsCar specialization

src/main/java/org/example/model/SportsCar.java

@@ -0,0 +1,31 @@
+package org.example.model;
+
+/*
+ * SportsCar extends GasCar.
+ *
+ * Special service logic for SportsCar:
+ * - needsService(): return true if mileage > 5000
+ * - performService():
+ *     Print "High-performance brake system checked"
+ */
+
+public class SportsCar extends GasCar {
+
+    private double zeroToHundred;
+
+    public SportsCar(String brand, String model, int year,
+                     double mileage, int seats,
+                     double fuelLevel, String fuelType,
+                     double zeroToHundred) {
+
+        super(brand, model, year, mileage, seats,
+                fuelLevel, fuelType);
+
+        this.zeroToHundred = zeroToHundred;
+    }
+
+    // TODO: Override showDetails()
+    // Print header
+    // Call super.showDetails()
+    // Print acceleration time
+}