Add Shared_pointer example

Author: mprse

APIs_Platform/Shared_pointer/README.md

@@ -0,0 +1,18 @@
+#include "platform/SharedPtr.h"
+
+int main(void)
+{
+    struct MyStruct {
+        int a;
+    };
+
+    // Create shared pointer
+    SharedPtr<MyStruct> ptr(new MyStruct);
+
+    // Increase reference count
+    SharedPtr<MyStruct> ptr2(ptr);
+
+    ptr = nullptr; // Reference to the struct instance is still held by ptr2
+
+    ptr2 = nullptr; // The raw pointer is freed
+}