Add VfsFile and VfsDirectory classes

src/core/file_sys/vfs.cpp

@@ -0,0 +1,7 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/file_sys/vfs.h"
+
+namespace FileSys {}