Add missing nostalgia directory level in src tree

src/nostalgia/player/main.cpp

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2017 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <nostalgia/core/core.hpp>
+
+using namespace nostalgia;
+
+int main() {
+	core::init();
+	core::initConsole();
+	core::puts(9 * 32 + 8, "HELLO,WORLD!");
+	core::puts(10 * 32 + 8, "01234 56789");
+	while (1);
+	return 0;
+}