Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/github.com/googleapis/gnostic/plugins/gnostic-go-generator/main.go

@@ -0,0 +1,71 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// gnostic_go_generator is a sample Gnostic plugin that generates Go
+// code that supports an API.
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+
+	plugins "github.com/googleapis/gnostic/plugins"
+)
+
+// This is the main function for the code generation plugin.
+func main() {
+	env, err := plugins.NewEnvironment()
+	env.RespondAndExitIfError(err)
+
+	packageName := env.Request.OutputPath
+
+	// Use the name used to run the plugin to decide which files to generate.
+	var files []string
+	switch {
+	case strings.Contains(env.Invocation, "gnostic-go-client"):
+		files = []string{"client.go", "types.go", "constants.go"}
+	case strings.Contains(env.Invocation, "gnostic-go-server"):
+		files = []string{"server.go", "provider.go", "types.go", "constants.go"}
+	default:
+		files = []string{"client.go", "server.go", "provider.go", "types.go", "constants.go"}
+	}
+
+	// Get the code surface model.
+	model := env.Request.Surface
+
+	if model == nil {
+		err = errors.New("No generated code surface model is available.")
+		env.RespondAndExitIfError(err)
+	}
+
+	// Customize the code surface model for Go
+	NewGoLanguageModel().Prepare(model)
+
+	modelJSON, _ := json.MarshalIndent(model, "", "  ")
+	modelFile := &plugins.File{Name: "model.json", Data: modelJSON}
+	env.Response.Files = append(env.Response.Files, modelFile)
+
+	// Create the renderer.
+	renderer, err := NewServiceRenderer(model)
+	renderer.Package = packageName
+	env.RespondAndExitIfError(err)
+
+	// Run the renderer to generate files and add them to the response object.
+	err = renderer.Render(env.Response, files)
+	env.RespondAndExitIfError(err)
+
+	// Return with success.
+	env.RespondAndExit()
+}