Updated basic example

examples/basic.php

@@ -2,6 +2,13 @@
 
 require_once __DIR__."/../vendor/autoload.php";
 
+/*
+ * This example will flash a led connected on pin 0 (GPIO17 on a Pi). If you are
+ * not on a Pi, please change (or remove) the mapper below and update the pin
+ * numbers to match.
+ *
+ */
+
 use NoccyLabs\Gpio\Gpio;
 use NoccyLabs\Gpio\GpioMapper\WiringPiMapper;
 
@@ -23,6 +30,7 @@ $led = $gpio[0]
     ->setLabel("LED pin")
     ->setValue(0);
 
+// Flash the led
 $x = 0;
 while(true) {
     $x = (int)(!$x);