Update README.md

Author: Bindambc

README.md

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 # Java Binance API
 
+[![Java CI with Maven](https://github.com/Bindambc/binance-java-api/actions/workflows/maven.yml/badge.svg)](https://github.com/Bindambc/binance-java-api/actions/workflows/maven.yml)
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 binance-java-api is a lightweight Java library for interacting with the [Binance API](https://developers.binance.com/docs/api/scopes), providing complete API coverage, and supporting synchronous and asynchronous requests, as well as event streaming using WebSockets.
 
 ## Features