Add the assembly blink to the sdk examble.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

CMakeLists.txt

@@ -13,6 +13,7 @@ pico_sdk_init()
 # rest of your project
 add_executable(hello_world
     hello_world.c
+    led.s
 )
 
 # Add pico_stdlib library which aggregates commonly used features