Update tuto_nmigen.md

tuto_nmigen.md

@@ -131,4 +131,14 @@ More research needed.
 
 Here is an example of the initialisation of the LEDs' array :
 
+![alt text](./Images/LED_Nmigen.png "LEDs initialisation")
 
+The LEDs' array is a byte array.
+
+The card has 5 LEDs :
+
+* First one on the left
+* Second one at the top
+* Third one on the right
+* Fourth one at the bottom
+* Fifth one in the middle