超简单商城app架构，只有核心功能：首页、购物车、我的，最适合做二次开发的开源框架。
界面设计主要参考网易严选，因为相对于淘宝，天猫，京东，拼多多，网易严选业务较简单一些。
项目框架采用MVP实现，网络通讯（retrofit + RxJava2），本地数据库通讯（room + RxJava2） 用到的开源框架：
https://github.com/zss945/shop-mall-android
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