Further consolidate the libraries

service/grpc/examples/greeter/gateway/README.md

@@ -0,0 +1,29 @@
+# GRPC Gateway
+
+This directory contains a grpc gateway generated using [grpc-ecosystem/grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway).
+
+Services written with [micro/go-micro/service/grpc](https://github.com/micro/go-micro/service/grpc) are fully compatible with the grpc-gateway and any other 
+grpc services.
+
+Go to [grpc-ecosystem/grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway) for details on how to generate gateways. We 
+have generated the gateway from the same proto as the greeter server but with additional options for the gateway.
+
+## Usage
+
+Run the go.micro.srv.greeter service
+
+```
+go run ../server/main.go --server_address=localhost:9090
+```
+
+Run the gateway
+
+```
+go run main.go
+```
+
+Curl your request at the gateway (localhost:8080)
+
+```
+curl -d '{"name": "john"}' http://localhost:8080/greeter/hello
+```