Feature blinking led example

[fofolevrai]

Hi Yoneken,

Following your second request, I've merged my LED example into yours. You're original code deals with 4 LEDs, I had to remove one as NUCLEO-F401RE wired only 3 PWMs on the used port. Thus, this code should run on both STM32F303 as well. Could you please validate? All the rest should behave as you did.

Note: By the way, I've renamed it BlinkingLED.