Example to demonstrate usage of `mbed_stats_cpu_get()` API usage

Revision:
15:86c93f5d67c4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CONTRIBUTING.md	Thu Nov 29 16:15:33 2018 +0000
@@ -0,0 +1,5 @@
+# Contributing to Mbed OS
+
+Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/latest/reference/contributing.html).