add requirements.txt

requirements.txt

@@ -0,0 +1,9 @@
+deepagents>=0.6.0
+langchain>=1.2.10
+langchain-openai>=1.1.9
+langgraph>=0.2.0
+python-dotenv>=1.0.0
+httpx>=0.27.0
+markdownify>=0.13.0
+tavily-python>=0.3.0
+duckduckgo-search>=6.0.0