Rtos API example

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+# mbed OS code base
+
+This is the code documentation for mbed OS.
+
+For more information, please see:
+
+* [The mbed OS API References](https://docs.mbed.com/docs/mbed-os-api-reference/)
+* [The mbed OS Handbook](https://docs.mbed.com/docs/mbed-os-handbook/)