Added copyright notices on new files

src/common/construct.h

@@ -1,4 +1,9 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
 #pragma once
+
 #include <boost/serialization/serialization.hpp>
 
 class construct_access {