Merge pull request #1 from vito16/dev

修改
合并dev分支，新增购物车功能
Merge pull request #4 from vito16/dev

购物车功能完成
修改日志级别
Merge pull request #12 from vito16/dev

Dev
Merge pull request #13 from vito16/dev

Dev
Merge pull request #14 from vito16/dev

合并修改内容
Merge pull request #15 from vito16/dev

Dev
升级了依赖的版本号
修改README