langchain extensions for data files and their libraries

services/rag/langchain/QWEN.md

@@ -18,10 +18,12 @@ The project follows a phased development approach with CLI entry points for diff
 
 ```
 rag-solution/services/rag/langchain/
+├── .env               # Environment variables
 ├── .env.dist          # Environment variable template
 ├── .gitignore         # Git ignore rules
 ├── app.py             # Main application file (currently empty)
 ├── cli.py             # CLI entrypoint with click library
+├── EXTENSIONS.md      # Supported file extensions and LangChain loaders
 ├── PLANNING.md        # Development roadmap and phases
 ├── QWEN.md            # Current file - project context
 ├── requirements.txt   # Python dependencies
@@ -49,10 +51,10 @@ The project is organized into 6 development phases as outlined in `PLANNING.md`:
 - [x] Implement "ping" command that outputs "pong"
 
 ### Phase 2: Framework Installation & Data Analysis
-- [ ] Install Langchain as base RAG framework
-- [ ] Analyze data folder extensions and create `EXTENSIONS.md`
-- [ ] Install required loader libraries
-- [ ] Configure environment variables
+- [x] Install Langchain as base RAG framework
+- [x] Analyze data folder extensions and create `EXTENSIONS.md`
+- [x] Install required loader libraries
+- [x] Configure environment variables
 
 ### Phase 3: Vector Storage Setup
 - [ ] Install Qdrant client library