f blink sketch template now blinks actually

templates/blink/src/sketch.pde

@@ -1,8 +1,15 @@
 
+#define LED_PIN 13
+
 void setup()
 {
+    pinMode(LED_PIN, OUTPUT);
 }
 
 void loop()
 {
+    digitalWrite(LED_PIN, HIGH);
+    delay(100);
+    digitalWrite(LED_PIN, LOW);
+    delay(900);
 }