samples: basic: blinky_pwm: Add support for nucleo_wb55rg platform

Create a board overlay file in the application directory to add
pwm-led0 entry over default device tree. Also, include instruction
in the README file that connection of external LED at pin PA8 is
required for the demo to work.

Signed-off-by: Waqas Mazhar <waqas.mazhar@planetinnovation.com.au>
2 files changed