Update requirements.txt

requirements.txt

@@ -2,5 +2,12 @@
 torch==2.1.2+cpu
 torchvision==0.16.2+cpu
 streamlit==1.35.0
-sentence-transformers==2.7.0 
-# Start with just these. We'll add more later.
+langchain==0.2.1
+langchain-pinecone==0.1.1
+langchain-community==0.2.1
+langchain-groq==0.1.5
+sentence-transformers==2.7.0
+cohere==5.5.8
+python-dotenv==1.0.1
+pydantic==2.7.4
+pinecone-client==3.2.2