Update the description of Service-Center in Readme
# Apache-Incubator-ServiceComb-Service-Center
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-Apache ServiceComb (incubating) service-center allows services to register their instance information and to discover providers of a given service.
+Apache ServiceComb (incubating) Service-Center is a Restful based service-registry that provides micro-services discovery and micro-service management. It is based on Open API format and provides features like service-discovery, fault-tolerance, dynamic routing, notify subscription and scalable by design. It has high performance cache design and separate entity management for micro-services and their instances. It provides out of box support for metrics and tracing. It has a web portal to manage the micro-services.
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## Features
- **Open API**: API doc(Open API format) management for microservice
- **Metadata**: Metadata management for both microservice and microservice instance
