Updated README.md

RAG-pipelines/RAG-Pipeline-Single-Node/README.md

+### Current pipeline architecture:
+
+The refactored RAG pipeline (single-node) is designed to handle the connection to the unified LLM interface.
+
+![alt text](image.png)
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+Key features
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+- Bi-directional streaming is enabled
+- Loading and ingestion - dual possibility (PDF Upload and FAISS embeddings)
+- Save workspace for future use
+
+
+This pipeline is currently in developmental stages and will undergo frequent changes. Contributions, suggestions, and feedback are welcome to help improve this project.
+
+Please refer to the following ticket to better understand the pipeline structure, eclipse/graphene/tutorials#45.