Add ScopedRamExecutionLock example

Author: mprse

APIs_Platform/ScopedRamExecutionLock/README.md

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+## ScopedRamExecutionLock example
+
+The example shows how to use ScopedRamExecutionLock class for enabling execution from RAM. 

APIs_Platform/ScopedRamExecutionLock/main.cpp

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+#include "mbed.h"
+
+int main()
+{
+    // Enable execution from RAM while in main
+    ScopedRamExecutionLock make_ram_executable;
+
+    //some_function_in_ram();
+}