Kenji Arai / Mbed OS Check_StandBy

Added Standby mode into WakeUp library. This is a checking program for the standby mode on Nucleo-F446RE and other STM32 series.

Dependencies:   WakeUp

Fork of study_step0 by Team_PjL

Please refer notebook.
/users/kenjiArai/notebook/standby-mode-current-consumption-on-nucleo-f446re/#

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