Update README.md

Author: raphaelDkhn

README.md

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+🚨⚠️🚨⚠️🚨⚠️
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+**This project has been archived and is no longer maintained. We're now developing [LuminAIR](https://github.com/gizatechxyz/LuminAIR), a new and super-efficient zkML framework based on a custom AIR, proven with the [STWO](https://github.com/starkware-libs/stwo) Prover.**
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+**We'd like to thank all the Orion contributors and hope to see you again in this new journey.**
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+🚨⚠️🚨⚠️🚨⚠️
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+---
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 Orion is an open-source, community-driven framework dedicated to Provable Machine Learning. It provides essential components and a new ONNX runtime for building verifiable Machine Learning models using [STARKs](https://starkware.co/stark/).
 
 ## 🤔 What is ONNX Runtime?