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.cpp

@@ -0,0 +1,13 @@
+#include "PositionSensor.h"
+
+PositionSensor::PositionSensor(int pin) : _pin(pin) {}
+
+void PositionSensor::begin() {
+  Serial.begin(115200);
+  pinMode(_pin, INPUT);
+}
+
+void PositionSensor::Measure() {
+  int value = analogRead(_pin);
+  Serial.println(value);
+}