docs: add brand logo to header + related-libraries footer

Match the visual + cross-linking pattern used by the other newsdataapi/*
client repos.

Author: arjunjain

README.md

@@ -1,5 +1,7 @@
 <div align="center">
 
+![Newsdata.io logo](https://raw.githubusercontent.com/newsdataapi/newsdata-java-sdk/main/newsdata-logo.png)
+
 # Newsdata.io Java SDK
 
 [![Maven Central](https://img.shields.io/maven-central/v/io.newsdata/newsdataapi.svg?label=maven&color=blue)](https://central.sonatype.com/artifact/io.newsdata/newsdataapi)
@@ -242,6 +244,21 @@ Artifacts appear on Maven Central indexes within ~10–30 minutes after a succes
 
 Unlike npm, PyPI, and pub.dev, the Sonatype Central Portal doesn't yet support tokenless GitHub Actions publishing via OIDC — it's on their roadmap. Until then, the user-token + GPG-signing flow above is the supported path.
 
+## Related libraries
+
+Official Newsdata.io clients across languages and runtimes:
+
+- **Python** — [newsdataapi/python-client](https://github.com/newsdataapi/python-client) ([PyPI](https://pypi.org/project/newsdataapi/))
+- **Node.js** — [newsdataapi/newsdata-nodejs-client](https://github.com/newsdataapi/newsdata-nodejs-client) (npm)
+- **React (hooks)** — [newsdataapi/newsdata-reactjs-client](https://github.com/newsdataapi/newsdata-reactjs-client) (npm)
+- **PHP** — [newsdataapi/php-client](https://github.com/newsdataapi/php-client) ([Packagist](https://packagist.org/packages/newsdataio/newsdataapi))
+- **.NET** — [newsdataapi/newsdata-dotnet-sdk](https://github.com/newsdataapi/newsdata-dotnet-sdk) ([NuGet](https://www.nuget.org/packages/Newsdata.Api/))
+- **Go** — [newsdataapi/newsdata-go-client](https://github.com/newsdataapi/newsdata-go-client) (Go modules)
+- **Dart / Flutter** — [newsdataapi/newsdata-flutter-client](https://github.com/newsdataapi/newsdata-flutter-client) (pub.dev)
+- **MCP Server (AI assistants)** — [newsdataapi/newsdata.io-mcp](https://github.com/newsdataapi/newsdata.io-mcp) ([PyPI](https://pypi.org/project/newsdata-mcp/))
+
+Also see [free news datasets](https://github.com/newsdataapi/newsdata.io-free-datasets) for ML / NLP work.
+
 ## License
 
 [MIT](./LICENSE)