add Arduino code

Arduino/AnalogReadSerial_V2/AnalogReadSerial_V2.ino

+
+void setup() {
+  // initialize serial communication at 115200 or 9600 bits per second:
+  Serial.begin(9600);
+}
+
+void loop() {
+  if(Serial.available()>0){
+    char userinput = Serial.read();
+
+    if(userinput == 'g'){
+      int sensorValue = analogRead(A0);
+      Serial.println(sensorValue);
+      delay(100);        // delay in between reads for stability
+    }
+  } 
+}