feat: Add goctl quickstart (#1889)

* Add goctl quickstart

* Format code

* Format code

tools/goctl/rpc/cli/zrpc.go

@@ -20,7 +20,7 @@ var (
 
 // ZRPC generates grpc code directly by protoc and generates
 // zrpc code by goctl.
-func ZRPC(cmd *cobra.Command, args []string) error {
+func ZRPC(_ *cobra.Command, args []string) error {
 	protocArgs := wrapProtocCmd("protoc", args)
 	pwd, err := os.Getwd()
 	if err != nil {