Added comments to Basics examples

build/shared/examples/1.Basics/AnalogReadSerial/AnalogReadSerial.ino

@@ -1,15 +1,21 @@
 /*
   AnalogReadSerial
- Reads an analog input on pin 0, prints the result to the serial monitor 
+  Reads an analog input on pin 0, prints the result to the serial monitor.
+  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
  
  This example code is in the public domain.
  */
 
+// the setup routine runs once when you press reset:
 void setup() {
+  // initialize serial communication at 9600 bits per second:
   Serial.begin(9600);
 }
 
+// the loop routine runs over and over again forever:
 void loop() {
+  // read the input on analog pin 0:
   int sensorValue = analogRead(A0);
+  // print out the value you read:
   Serial.println(sensorValue);
 }