Update README.md

Author: matthewhorridge

README.md

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 # webprotege-authorization-service
 The service that provides details of what a user is allowed to do
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+![webprotege-authorization-service CI](https://github.com/protegeproject/webprotege-authorization-service/actions/workflows/ci.yaml/badge.svg)
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+## webprotege-authorization-service on Maven Central
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+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/edu.stanford.protege/webprotege-authorization-service/badge.svg)](https://maven-badges.herokuapp.com/maven-central/edu.stanford.protege/webprotege-authorization-service)