Example program for LED blinky

Revision:
0:71e6966178f5
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Fri Oct 05 08:30:50 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#610e35ddc6d59f153173c1e7b2748cf96d6c9bcd