CMake projectconfig

Create a CMake package, so the library can be found via find_package.

Also create an example CMake project, that uses the library.

contrib/voro++/src/CMakeLists.txt

@@ -7,6 +7,12 @@ file (GLOB ${MODULE_NAME}_SRCS voro++.cc)
 # Create the library.
 add_library (${MODULE_NAME} ${${MODULE_NAME}_SRCS})
 
-install (TARGETS ${MODULE_NAME} 
-		ARCHIVE DESTINATION lib 
+target_include_directories(${MODULE_NAME}
+	INTERFACE
+	"$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>"
+	"$<INSTALL_INTERFACE:include>")
+
+install (TARGETS ${MODULE_NAME}
+	EXPORT ALLTargets
+		ARCHIVE DESTINATION lib
 		LIBRARY DESTINATION lib)