Update README.md

Migration info

README.md

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+<div align="center">
+  <h1>⚠️ This repository has migrated ⚠️</h1>
+  <p>This repository will not be maintained any further, and issues and pull requests may be ignored. For an up to date codebase, issues, and pull requests, please continue to the <a href="https://github.com/llcresearch/sire">new repository</a>.</p>
+</div>
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+---
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 <div align="center">
 
 <img src="./picture/sire_logo.png" height="70">