NS example

Revision:
0:f40a402e1725
diff -r 000000000000 -r f40a402e1725 mbed-os.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Tue May 02 15:29:27 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#ed4febefdede4e88743ca12909b7bc9a3993889a