[CMake] Generate cmake target that other libraries can use

... to express their dependency on this library and retrieve any
configuration information such as the include directory, binary
to link to (if any), transitive dependencies, necessary compiler
options or the required c++ standards level.

CMakeLists.txt

@@ -0,0 +1,22 @@
+# Copyright 2018 Mike Dev
+# 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
+#
+# NOTE: CMake support for Boost.System is currently experimental at best
+#       and the interface is likely to change in the future
+
+cmake_minimum_required(VERSION 3.5)
+project(BoostSystem)
+
+add_library(boost_system INTERFACE)
+
+add_library(Boost::system ALIAS boost_system)
+
+target_include_directories(boost_system INTERFACE include)
+
+target_link_libraries(boost_system
+    INTERFACE
+        Boost::config
+        Boost::winapi
+)
+