Create README.md

Author: afizs

langchain/README.md

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+## 1. Install all the dependencies 
+`uv sync` 
+## 2. Add your OpenAI API key to `.env` 
+
+## 3. Start the jupyter lab server 
+`uv run jupyter lab`
+
+
+🔗 Source
+This example is sourced from Lesson 1: Create Agent of the LangChain Essentials Python course, available here:
+
+https://academy.langchain.com/courses/take/langchain-essentials-python/lessons/69388275-lesson-1-create-agent