feat: Add Arduino code for position tracking

The code changes include adding a new Arduino sketch for position tracking. The sketch is located at `code/arduino/Position-tracking/Position-tracking.ino`. Additionally, a new class `PositionSensor` is added with its corresponding header and implementation files. This class handles the position sensor functionality and includes methods for initialization and measurement.

The commit message suggests that the changes are a new feature addition related to position tracking in the Arduino code.

code/arduino/Position-tracking/PositionSensor.h

@@ -0,0 +1,15 @@
+#ifndef PositionSensor_h
+#define PositionSensor_h
+
+#include "Arduino.h"
+
+class PositionSensor {
+  public:
+    PositionSensor(int pin);
+    void begin();
+    void Measure();
+  private:
+    int _pin;
+};
+
+#endif