Added version.hpp

include/boost/gil/version.hpp

@@ -0,0 +1,27 @@
+//
+// Copyright (c) 2018 Christian Henning (chhenning 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)
+//
+// Official repository: https://github.com/boostorg/gil
+//
+
+#ifndef BOOST_GIL_VERSION_HPP
+#define BOOST_GIL_VERSION_HPP
+
+/** @def BOOST_GIL_API_VERSION 
+    Identifies the API version of gil.
+    This is a simple integer that is incremented by one every
+    time a set of code changes is merged to the develop branch.
+*/
+#define BOOST_GIL_VERSION 22
+
+/**
+//  BOOST_GIL_LIB_VERSION must be defined to be the same as BOOST_GIL_VERSION
+//  but as a *string* in the form "x_y[_z]" where x is the major version
+//  number, y is the minor version number, and z is the patch level if not 0.
+*/
+#define BOOST_GIL_LIB_VERSION "2_2"
+
+#endif