Get started with STM32 Nucleo

[EmanueleQuacchio]

Added documentation for STM32 Nucleo

[azurecla]

Hi @EmanueleQuacchio, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.azure.com.

TTYL, AZPRBOT;

[tameraw]

@EmanueleQuacchio - Can you please sign the CLA before we can merge it.

[azurecla]

@EmanueleQuacchio, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, AZPRBOT;