feat():initial version

install/boost_1_75_0/include/boost/gil/gray.hpp

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+//
+// Copyright 2005-2007 Adobe Systems Incorporated
+//
+// Distributed under the Boost Software License, Version 1.0
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+#ifndef BOOST_GIL_GRAY_HPP
+#define BOOST_GIL_GRAY_HPP
+
+#include <boost/gil/utilities.hpp>
+#include <boost/gil/detail/mp11.hpp>
+
+namespace boost { namespace gil {
+
+/// \ingroup ColorNameModel
+/// \brief Gray
+struct gray_color_t {};
+
+/// \ingroup ColorSpaceModel
+using gray_t = mp11::mp_list<gray_color_t>;
+
+/// \ingroup LayoutModel
+using gray_layout_t = layout<gray_t>;
+
+}}  // namespace boost::gil
+
+#endif
+