Update README.md

Author: jfullstackdev

README.md

@@ -35,7 +35,30 @@ Then, go to `Code` section and copy the initial
 code below:
 
 ```
+void setup()
+{
+  pinMode(13, OUTPUT);
+  pinMode(12, OUTPUT);
+  pinMode(11, OUTPUT);
+}
 
+void loop()
+{
+  digitalWrite(13, HIGH);
+  digitalWrite(12, LOW);
+  digitalWrite(11, LOW);
+  delay(1000);
+  
+  digitalWrite(13, LOW);
+  digitalWrite(12, HIGH);
+  digitalWrite(11, LOW);
+  delay(1000);
+  
+  digitalWrite(13, LOW);
+  digitalWrite(12, LOW);
+  digitalWrite(11, HIGH);
+  delay(1000);
+}
 ```
 
 ### Code Explanation