[CMake] Add minimal cmake support

- CMake file only supports add_subdirectory workflow.
- Provides Boost::intrusive target,
  but no installation and no unit tests..

CMakeLists.txt

@@ -0,0 +1,25 @@
+# Copyright 2019 Mike Dev
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
+#
+# NOTE: CMake support for Boost.Intrusive is currently experimental at best
+#       and the interface is likely to change in the future
+
+cmake_minimum_required( VERSION 3.5 )
+
+project( Boost.Intrusive LANGUAGES CXX )
+
+add_library (boost_intrusive INTERFACE )
+add_library( Boost::intrusive ALIAS boost_intrusive )
+
+target_include_directories( boost_intrusive INTERFACE include )
+
+target_link_libraries( boost_intrusive
+    INTERFACE
+        Boost::assert
+        Boost::config
+        Boost::container_hash
+        Boost::core
+        Boost::move
+        Boost::static_assert
+)