Add Solr MCP Server tutorial to reference guide

[adityamparikh]

Summary

• Add a new tutorial for the Solr MCP Server that enables AI assistants like Claude to interact with Apache Solr via the Model Context Protocol (MCP)
• Tutorial covers STDIO and HTTP transport modes with Docker and source-based deployment options
• Includes Claude Desktop integration examples and OAuth2 security configuration

Tutorial Contents

• What is MCP? - Introduction with link to MCP specification
• Features - MCP tools (search, index_documents, listCollections, etc.) and resources
• STDIO Mode - Docker and build-from-source instructions with Claude Desktop config
• HTTP Mode - Docker and build-from-source instructions with security notes
• Environment Variables - Reference table for configuration options
• Example Usage - Sample queries users can try with Claude

Test plan

• ./gradlew buildLocalSite passes without errors
• Review rendered tutorial in generated site

🤖 Generated with Claude Code

[epugh]

Notes to Eric:

• Focus on the Jar running (and yes, java 25, but come on folks!), not the docker until we get that deployed porperly.
• Move all the stuff below the STDIO versu HTTP into the github.com/apache/solr-mcp repo to live. Keep the tutorial as a short tutorial! No reference in the tutorial.