Add ScopedRomWriteLock example

Author: mprse

APIs_Platform/ScopedRomWriteLock/README.md

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+## ScopedRamExecutionLock example
+
+The example shows how to use ScopedRomWriteLock class for enabling writing to ROM. 

APIs_Platform/ScopedRomWriteLock/main.cpp

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+#include "mbed.h"
+
+int main()
+{
+    // Enable execution from RAM while in main
+    ScopedRomWriteLock make_rom_writable;
+
+    //custom_flash_programming();
+}