add readme for blinking led example with schema

Author: LouWii

Test-RGB-LED/README.md

@@ -4,6 +4,8 @@ It's possible and very easy to power an RGB LED from an Arduino, and control its
 
 ## Schema
 
+The resistor is 220Ohm, but you can use a resistor from 100Ohm up to 1000Ohm.
+
 ![Schema](schema.png)
 
 ## Code

Test-blinking-LED/README.md

@@ -0,0 +1,13 @@
+# Blinking LED
+
+We need a resistor to avoid burning the LED. 
+
+## Schema
+
+The resistor is 220Ohm, but you can use a resistor from 100Ohm up to 1000Ohm.
+
+![Schema](schema.png)
+
+## Code
+
+There's not much to say about it, I believe the code and comments are enough to understand what's going on. We're not using any library whatsoever.