Update README.md to talk about the Maven and Gradle plugin and how to use it. #339
Description
Also, add a link to the SBT plugin that is currently outside this project: https://github.com/jrouly/sbt-openapi-style-validator
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Also, add a link to the SBT plugin that is currently outside this project: https://github.com/jrouly/sbt-openapi-style-validator