Enhance README with project badges

Added badges for license, build status, Maven Central, and Java version to README.

Author: tzolov

README.md

@@ -1,5 +1,9 @@
 # MCP Java SDK
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/license/MIT)
 [![Build Status](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/publish-snapshot.yml/badge.svg)](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/publish-snapshot.yml)
+[![Maven Central](https://img.shields.io/maven-central/v/io.modelcontextprotocol.sdk/mcp.svg?label=Maven%20Central)](https://central.sonatype.com/artifact/io.modelcontextprotocol.sdk/mcp)
+[![Java Version](https://img.shields.io/badge/Java-17%2B-orange)](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html)
+
 
 A set of projects that provide Java SDK integration for the [Model Context Protocol](https://modelcontextprotocol.org/docs/concepts/architecture). 
 This SDK enables Java applications to interact with AI models and tools through a standardized interface, supporting both synchronous and asynchronous communication patterns.