Update readme.md

readme.md

@@ -119,6 +119,16 @@ go get -u github.com/zeromicro/go-zero
    
    # for Go 1.16 and later
    go install github.com/zeromicro/go-zero/tools/goctl@latest
+
+   # docker for amd64 architecture
+   docker pull kevinwan/goctl
+   # run goctl like
+   docker run --rm -it -v `pwd`:/app kevinwan/goctl goctl --help
+
+   # docker for arm64 (M1) architecture
+   docker pull kevinwan/goctl:latest-arm64
+   # run goctl like
+   docker run --rm -it -v `pwd`:/app kevinwan/goctl:latest-arm64 goctl --help
    ```
 
    make sure goctl is executable.