add macos usage in readme.md
add macos usage in readme.md

chonglou/itpkg_old,iusky/itpkg_old,iusky/itpkg_old,chonglou/itpkg_old,chonglou/itpkg_old,iusky/itpkg_old,sdgdsffdsfff/itpkg_old,sdgdsffdsfff/itpkg_old,sdgdsffdsfff/itpkg_old