* update english documents

* refactor zk client

* update documents

* update zkclient

* update zkclient

* update documents

* add architecture-design

* change i18n

* update i18n

* update english documents

* add architecture-design

* update english documents

* update en-US documents

* add architecture-design

* update demo site

* add mybatis plus model

* modify mybatisplus

* modify mybatisplus

* change interface by mybatisplus

* add unit test

* refactor dao interface.

* add unit test for dao...

* add unit test for dao...