Add 01_blinky_button

apps/01_blinky_button/boards/stm32f4_disco.overlay

@@ -0,0 +1,9 @@
+/ {
+    aliases {
+        led0 = &red_led_5;
+        led1 = &blue_led_6;
+        led2 = &green_led_4;
+        led3 = &orange_led_3;
+		sw0 = &user_button;
+    };
+};