Update requirements.txt

requirements.txt

@@ -1,6 +1,8 @@
-gradio==3.31.0            
-llama-index==0.5.5       
-huggingface-hub==0.16.4  
-pdfplumber==0.7.4        
-torch==2.0.0             
-transformers==4.26.0     
+gradio==3.31.0            # For creating interactive web applications  
+llama-index==0.5.5       # For indexing and querying documents  
+huggingface-hub==0.16.4  # For accessing Hugging Face models  
+pdfplumber==0.7.4        # For extracting text from PDF files  
+torch==2.0.0             # Required for PyTorch-based models  
+transformers==4.26.0     # For Hugging Face's Transformers library  
+langchain==0.0.300       # Include Langchain for LLM integration  
+langchain-community==0.0.6 # Include Langchain Community for additional models