Update readme

Author: pamelafox

README.md

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 # RAG on PostgreSQL
 
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-[![Open in Dev Containers](https://img.shields.io/static/v1?style=for-the-badge&label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](placeholder)
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+[![Open in Dev Containers](https://img.shields.io/static/v1?style=for-the-badge&label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/azure-samples/rag-postgres-openai-python)
 
 This project creates a web-based chat application with an API backend that can use OpenAI chat models to answer questions about the items in a PostgreSQL database table. The frontend is built with React and FluentUI, while the backend is written with Python and FastAPI.