Add llm4j to Artificial Intelligence

[srijithunni7182]

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• Resource

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• I searched the list and existing issues for duplicates.
• I changed README_SOURCE.md, not the generated README.md.
• This pull request contains one suggestion.
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Summary by cubic

Adds llm4j to the Artificial Intelligence section of README_SOURCE.md. It provides an LLM-agnostic toolkit for building ReAct agents with tool calling, MCP client support, RAG, semantic memory, cost-aware provider routing, and audit/PII-detection hooks.

^{Written for commit aa3b249. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

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