[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 +1,12 @@
+cmake_minimum_required(VERSION 3.8)
+project(boost-assert LANGUAGES CXX)
+
+add_library(boost_assert INTERFACE)
+add_library(Boost::assert ALIAS boost_assert)
+
+target_include_directories(boost_assert INTERFACE include)
+
+target_link_libraries(boost_assert
+	INTERFACE
+		Boost::config
+)