Event class example to manually instantiate, configure and post events.

Revision:
0:86c4bf2d90fa
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Nov 30 21:50:58 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#182bbd51bc8d1b6217477c2b5de3f1d0c5e6249f