a simply blinky test program

Dependencies:   mbed

Revision:
0:ba3b9b884e1b
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Jun 17 06:17:47 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/5aab5a7997ee
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