Simple demo with button pooling input

Dependencies:   mbed

Revision:
0:3d66dff04e7d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Feb 17 18:18:23 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/7130f322cb7e
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