Example using the user button on DISCO L475E IOT01, using interrupts

Dependencies:   mbed

Revision:
0:fc82b2d5fe07
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Nov 08 17:09:25 2018 +0000
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+https://os.mbed.com/users/mbed_official/code/mbed/builds/e95d10626187
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