Add requirements.txt

requirements.txt

@@ -0,0 +1,8 @@
+langchain>=1.0.0
+langgraph>=1.0.0
+langchain-chroma>=0.1.0
+langchain-ollama>=0.1.0
+langchain-core>=0.1.0
+python-dotenv>=1.0.0
+httpx>=0.27.0
+pydantic>=2.0.0