Add readme file for smp configuration

examples/sample_configuration/smp/readme.md

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+# Configuration support for FreeRTOS SMP
+
+## Overview
+The FreeRTOSConfig.h provided in this folder is a sample configuration that will
+assist you in preparing the configuration to enable SMP support in the FreeRTOS
+Kernel for your application.
+
+Based on single core sample configuration file, this configuration file is created
+with minimal configuration change. More SMP scheduler configurations can be found
+in [Symmetric Multiprocessing (SMP) with FreeRTOS](https://freertos.org/symmetric-multiprocessing-introduction.html)