Update README.md

helloworld/README.md

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+A simple hello world service
+
 # Helloworld Service
 
-This is the Helloworld service
+Helloworld simply returns a personalized message in response to a name.
-
-## Overview
-
-An example of how to write a simple helloworld service. This can also be generated using `micro new helloworld`.
-
-## Usage
-
-```
-# run the server
-micro server
-
-# run the service
-micro run github.com/micro/services/helloworld
-
-## call the service
-micro call helloworld Helloworld.Call '{"name": "Alice"}'
-```