Added thirdparty: boost library

thirdparty/include/boost/mysql/string_view.hpp

@@ -0,0 +1,22 @@
+//
+// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// 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_MYSQL_STRING_VIEW_HPP
+#define BOOST_MYSQL_STRING_VIEW_HPP
+
+#include <boost/core/detail/string_view.hpp>
+
+namespace boost {
+namespace mysql {
+
+/// Type used to represent read-only string references, similar to `std::string_view`.
+using string_view = boost::core::string_view;
+
+}  // namespace mysql
+}  // namespace boost
+
+#endif