feat: add Code-Graph-RAG to Machine Learning software section

Signed-off-by: Vitali Avagyan <vitali87@users.noreply.github.com>

Author: Vitali Avagyan

README.md

@@ -361,6 +361,7 @@ A curated list of awesome research papers, datasets and software projects devote
 - [DeepSim](https://github.com/parasol-aser/deepsim) - a deep learning-based approach to measure code functional similarity.
 - [rnn-autocomplete](https://github.com/ZeRoGerc/rnn-autocomplete) - Neural code autocompletion with RNN (bachelor's thesis).
 - [MindsDB](https://github.com/mindsdb/mindsdb) - MindsDB is an Explainable AutoML framework for developers. With MindsDB you can build, train and use state of the art ML models in as simple as one line of code.
+- [Code-Graph-RAG](https://github.com/vitali87/code-graph-rag) - Builds knowledge graphs from multi-language codebases using Tree-sitter AST parsing and Memgraph. Uses UniXcoder embeddings for semantic code search and enables natural language querying via an MCP server.
 
 #### Utilities