add memory trace example

APIs_Platform/Memory_tracing_ex_1/README.md

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+# Memory tracing trace example
+
+Example to demonstrate memory trace functionality in Mbed OS

APIs_Platform/Memory_tracing_ex_1/main.cpp

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+/*
+ * Copyright (c) 2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdlib.h>
+#include "mbed.h"
+#include "mbed_mem_trace.h"
+
+
+int main()
+{
+    mbed_mem_trace_set_callback(mbed_mem_trace_default_callback);
+    while (true) {
+        void *p = malloc(50);
+        printf("50B allocated at %p\n", p);
+
+        ThisThread::sleep_for(500);
+
+        free(p);
+        printf("50B freed at %p\n\n", p);
+    }
+}

APIs_Platform/Memory_tracing_ex_1/mbed_app.json

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+{
+    "macros": ["MBED_MEM_TRACING_ENABLED=1"]
+}