Add README in English

stream-agent/README.md

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+# Stream Agent
+
+This repository contains a simple LangChain agent that demonstrates the **stream** mode.
+
+## What it does
+
+The agent uses OpenAI’s LLM to answer a user query.  When the LLM decides to call an external tool it uses a small `get_price` function that returns a fake price for a product in a city.  The agent is executed with `AgentExecutor.stream` so the output appears token‑by‑token in the console.
+
+## How to run
+
+```bash
+# install dependencies
+pip install -r requirements.txt
+
+# run the example
+python main.py
+```
+
+The script will output the streamed response followed by the final result.
+
+---
+
+Feel free to experiment by changing the query or the tool implementation.