chore: add Codecov badge to README files

Author: BetaCat0

README-zh_CN.md

@@ -1,3 +1,13 @@
+<div align="center">
+
+[English](./README.md) | 简体中文
+
+</div>
+
+# Module Controller
+
+[![codecov](https://codecov.io/github/koupleless/module-controller/graph/badge.svg?token=L1SvoSDQsw)](https://codecov.io/github/koupleless/module-controller)
+
 低成本地让开源用户接入模块运维体系。
 
 # 架构设计

README.md

@@ -4,6 +4,10 @@ English | [简体中文](./README-zh_CN.md)
 
 </div>
 
+# Module Controller
+
+[![codecov](https://codecov.io/github/koupleless/module-controller/graph/badge.svg?token=L1SvoSDQsw)](https://codecov.io/github/koupleless/module-controller)
+
 ModuleController is Koupleless operation and scheduling system. It is a kubernetes operator application which can be deployed to your kubernetes cluster.
 
 For ModuleController user documentation, please see [here](https://koupleless.io/docs/tutorials/module-operation/module-online-and-offline/).