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/genetc.go

@@ -0,0 +1,34 @@
+package gogen
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util"
+)
+
+var etcTemplate = `{
+  "Name": "{{.serviceName}}.rpc",
+  "Log": {
+    "Mode": "console"
+  },
+  "ListenOn": "127.0.0.1:8080",
+  "Etcd": {
+    "Hosts": ["127.0.0.1:6379"],
+    "Key": "{{.serviceName}}.rpc"
+  }
+}
+`
+
+func (g *defaultRpcGenerator) genEtc() error {
+	etdDir := g.dirM[dirEtc]
+	fileName := filepath.Join(etdDir, fmt.Sprintf("%v.json", g.Ctx.ServiceName.Lower()))
+	if util.FileExists(fileName) {
+		return nil
+	}
+	return util.With("etc").
+		Parse(etcTemplate).
+		SaveTo(map[string]interface{}{
+			"serviceName": g.Ctx.ServiceName.Lower(),
+		}, fileName, false)
+}