docs: update CONTRIBUTING.md

CONTRIBUTING.md

@@ -8,7 +8,7 @@ This project only has one main branch, namely the `main` branch. If you want to
 
 ## Local development
 
-It is recommended to develop and debug through the web. First, start the backend service, the code is located in `cmd/api/main.go`, the default port of the service is `9999`, and then start the front-end project in `debug` mode to run.
+It is recommended to develop and debug through the web. First, start the backend service, and start it by the command line `go run cmd/api/main.go`, the default port of the service is `9999`, and then start the front-end flutter project in `debug` mode to run.
 
 ## Translation
 

CONTRIBUTING_zh-CN.md

@@ -8,7 +8,7 @@
 
 ## 本地开发
 
-建议通过 web 端进行开发调试，首先启动后端服务，代码位于 `cmd/api/main.go` ，服务启动默认端口为 `9999`，然后以 `debug` 模式启动前端项目即可运行。
+建议通过 web 端进行开发调试，首先启动后端服务，通过命令行 `go run cmd/api/main.go` 启动 ，服务启动默认端口为 `9999`，然后以 `debug` 模式启动前端 flutter 项目即可运行。
 
 ## 翻译