Update README.md

KuoHsing · KuoHsing · commit 3499937653d0 · 2014-08-16T21:37:27.000+08:00
diff --git a/README.md b/README.md
@@ -2,3 +2,5 @@ arduino
 =======
 
 Arduino codes
+
+This is the collection of my Arduino codes, which are basically forked from other repositories.
