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update service example readme

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examples/service/README.md
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# Service
This is an example of creating a micro service using the top level interface.
This is an example of creating a micro service.
## Prereqs
Micro services need a discovery system so they can find each other. Micro uses consul by default but
its easily swapped out with etcd, kubernetes, or various other systems. We'll run consul for convenience.
1. Follow the install instructions - [https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
Install consul
```shell
brew install consul
```
2. Run Consul
Alternative instructions - [https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
Run Consul
```shell
$ consul agent -dev -advertise=127.0.0.1
consul agent -dev -advertise=127.0.0.1
```
## Run the example
1. Get the service
Run the service
```shell
go get github.com/micro/go-micro/examples/service
go run main.go
```
2. Run the server
Run the client
```shell
$GOPATH/bin/service
```
3. Run the client
```shell
$GOPATH/bin/service --run_client
go run main.go --run_client
```
And that's all there is to it.