[CMake] Add disclaimer and turn tabs into spaces

CMakeLists.txt

@@ -1,6 +1,9 @@
 # Copyright 2018 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
+#
+# Partial (add_subdirectory only) and experimental CMake support
+# Subject to change; please do not rely on the contents of this file yet
 
 cmake_minimum_required(VERSION 3.5)
 project(BoostFusion LANGUAGES CXX)
@@ -11,16 +14,16 @@ add_library(Boost::fusion ALIAS boost_fusion)
 target_include_directories(boost_fusion INTERFACE include)
 
 target_link_libraries(boost_fusion
-	INTERFACE
-		Boost::config
-		Boost::container_hash
-		Boost::core
-		Boost::function_types
-		Boost::mpl
-		Boost::preprocessor
-		Boost::static_assert
-		Boost::tuple
-		Boost::type_traits
-		Boost::typeof
-		Boost::utility
+    INTERFACE
+        Boost::config
+        Boost::container_hash
+        Boost::core
+        Boost::function_types
+        Boost::mpl
+        Boost::preprocessor
+        Boost::static_assert
+        Boost::tuple
+        Boost::type_traits
+        Boost::typeof
+        Boost::utility
 )