Initial implementation of LangGraph reflection agent: add README.md

README.md

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+# LangGraph Reflection Agent
+
+This repository contains a simple implementation of a LangGraph agent that writes a short answer to a question, critiques it, and rewrites if necessary.
+
+## Requirements
+
+```bash
+pip install langgraph langchain-openai
+```
+
+## Usage
+
+```bash
+python main.py "Объясни студенту разницу между tool и resource в MCP"
+```