[CMake] Add minimal cmake file

Generate cmake target that can be used by other libraries
to express their dependency on this library and retrieve
any configuration information such as the include directory,
transitive dependencies, necessary compiler options or the
required c++ standards level.

CMakeLists.txt

@@ -0,0 +1,16 @@
+# 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
+
+cmake_minimum_required(VERSION 3.5)
+project(BoostIO LANGUAGES CXX)
+
+add_library(boost_io INTERFACE)
+add_library(Boost::io ALIAS boost_io)
+
+target_include_directories(boost_io INTERFACE include)
+
+target_link_libraries(boost_io
+    INTERFACE
+        Boost::config
+)