cpp: move source files into src/ directory

cpp/src/msgpack.h

@@ -0,0 +1,23 @@
+/*
+ * MessagePack for C
+ *
+ * Copyright (C) 2008-2009 FURUHASHI Sadayuki
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+#include "msgpack/object.h"
+#include "msgpack/zone.h"
+#include "msgpack/pack.h"
+#include "msgpack/unpack.h"
+#include "msgpack/sbuffer.h"
+#include "msgpack/vrefbuffer.h"