Add DualMotors example sketch

examples/Car/SimpleCarWithDualMotors/SimpleCarWithDualMotors.ino

@@ -0,0 +1,36 @@
+#include <Smartcar.h>
+
+ArduinoRuntime arduinoRuntime;
+const BrushedMotorPins leftFrontMotorPins{ 12, 14, 13 };
+const BrushedMotorPins leftRearMotorPins{ 22, 24, 23 };
+const BrushedMotorPins rightFrontMotorPins{ 25, 26, 27 };
+const BrushedMotorPins rightRearMotorPins{ 32, 34, 33 };
+
+BrushedMotor leftFrontMotor{ arduinoRuntime, leftFrontMotorPins };
+BrushedMotor leftRearMotor{ arduinoRuntime, leftRearMotorPins };
+BrushedMotor rightFrontMotor{ arduinoRuntime, rightFrontMotorPins };
+BrushedMotor rightRearMotor{ arduinoRuntime, rightRearMotorPins };
+
+DualMotor leftMotor{ leftFrontMotor, leftRearMotor };
+DualMotor rightMotor{ rightFrontMotor, rightRearMotor };
+
+DifferentialControl control{ leftMotor, rightMotor };
+
+SimpleCar car{ control };
+
+void setup()
+{
+    // Move forward for 3 seconds
+    car.setSpeed(50);
+    delay(3000);
+    // Start turning sharp left
+    car.setAngle(-90);
+    delay(3000);
+    // Straighten the car and move backward
+    car.setAngle(0);
+    car.setSpeed(-50);
+    delay(3000);
+    car.setSpeed(0);
+}
+
+void loop() {}