add libs to demo project using cmake-JZTXT

cmake_minimum_required(VERSION 2.8 FATAL_ERROR)

project("demo")

set(DEMO_INCLUDE_DIRS "./include")
set(DEMO_LIB_DIRS "./lib")

message("${DEMO_INCLUDE_DIRS}")
message("${DEMO_LIB_DIRS}")

include_directories("${DEMO_INCLUDE_DIRS}")
link_directories("${DEMO_LIB_DIRS}")

set(DEMO_SOURCE ./main.cpp)

add_executable(demo ${DEMO_SOURCE})

target_link_libraries(demo -lhelloworld)