TFmini sample code tested on mbedos5.x

Revision:
0:0a7b3a5aa563
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Tue Aug 21 05:16:43 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#f8b140f8d7cb226e41486c5df66ac4f3ce699219