docs: Updating documentation and license boilerplates in all files

Change-Id: I321fb0d85aaddf9150ed496fe03ee0e4dc738761
diff --git a/README-dev.md b/README-dev.md
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+Notes for ndn-cxx developers
+============================
+
+Code style
+----------
+
+ndn-cxx code is subject to [ndn-cxx code style](http://named-data.net/doc/ndn-cxx/current/code-style.html).
+
+Licensing
+---------
+
+If you agree with the terms of the New BSD License, please use the following license
+boilerplate into all `.hpp` and `.cpp` files:
+
+
+    /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+    /**
+     * Copyright (c) Year(s),  Copyright Holder.
+     * All rights reserved.
+     *
+     * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+     * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+     *
+     * This file licensed under New BSD License.  See COPYING for detailed information about
+     * ndn-cxx library copyright, permissions, and redistribution restrictions.
+     ////// [optional part] //////
+     *
+     * @author Author's Name <email@domain-or-homepage://url>
+     * @author Other Author's Name <another.email@domain-or-homepage://url>
+     ////// [end of optional part] //////
+     */