added local execution capabilities description to README

Author: abhishek-anand

README.md

@@ -4,6 +4,8 @@
 
 CodeRunner provides a secure MCP (Model Context Protocol) code execution server that runs inside a sandboxed environment on your Mac, powered by Apple's native [containers](https://github.com/apple/container). It allows you to safely execute code generated by AI models like Claude, OpenAI GPT, or Ollama.
 
+Leverage powerful remote LLMs (like ChatGPT or Claude Sonnet 4) to work with your local files—such as videos—securely on your Mac. The LLM runs in a sandboxed environment where it can install external libraries, generate code, and execute it locally without uploading your data to the cloud.
+
 This guide shows you how to use the pre-built CodeRunner sandbox.
 
 ## 🚀 Quick Start