cmake_htfhxx

#cmake由浅入深，入门代码

test_muti: g++ to compile muti files

test_makefile: a makefile demo

test_cmake:cmake to compile single file

test_cmake_muti: cmake to compile muti file

test_cmake_lit: subderectories and stablish a library

CMake ：https://zhuanlan.zhihu.com/p/52231167