rpc service generation (#26)

* add execute files

* add protoc-osx

* add rpc generation

* add rpc generation

* add: rpc template generation

* update usage

* fixed env prepare for project in go path

* optimize gomod cache

* add README.md

* format error

* reactor templatex.go

* remove waste code

tools/goctl/rpc/goen/genconfig.go

@@ -0,0 +1,29 @@
+package gogen
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util"
+)
+
+var configTemplate = `package config
+
+import "github.com/tal-tech/go-zero/rpcx"
+
+type (
+	Config struct {
+		rpcx.RpcServerConf
+	}
+)
+`
+
+func (g *defaultRpcGenerator) genConfig() error {
+	configPath := g.dirM[dirConfig]
+	fileName := filepath.Join(configPath, fileConfig)
+	if util.FileExists(fileName) {
+		return nil
+	}
+	return ioutil.WriteFile(fileName, []byte(configTemplate), os.ModePerm)
+}