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/#

Revision:
0:1672d0903bdc
Child:
1:abe49c3395cd
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Aug 10 20:50:46 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be