add codecov setting
add codecov setting

cuhkshenzhen/CUHKSZLib,Yexiaoxing/CUHKSZLib,cuhkshenzhen/CUHKSZLib,cuhkshenzhen/CUHKSZLib,alesiong/CUHKSZLib,Yexiaoxing/CUHKSZLib,alesiong/CUHKSZLib,Yexiaoxing/CUHKSZLib,alesiong/CUHKSZLib