add comment (#1071)

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README_zh.md

@@ -102,8 +102,8 @@ app.Run()
 ## Community
 * [Wechat Group](https://github.com/go-kratos/kratos/issues/682)
 * [Discord Group](https://discord.gg/BWzJsUJ)
+* Website:  [go-kratos.dev](https://go-kratos.dev)
 * QQ Group: 716486124
-
 ## Sponsors and Backers
 
 ![kratos](docs/images/alipay.png)

transport/transport.go

@@ -31,9 +31,17 @@ type Header interface {
 
 // Transporter is transport context value interface.
 type Transporter interface {
+	// grpc
+	// http
 	Kind() Kind
+	// Server Transport: grpc://127.0.0.1:9000
+	// Client Transport: discovery:///provider-demo
 	Endpoint() string
+	// Service full method selector generated by protobuf
+	// example: /helloworld.Greeter/SayHello
 	Operation() string
+	// http: http.Header
+	// grpc: metadata.MD
 	Header() Header
 }