Update README.md

Author: SvenTiigi

README.md

@@ -35,6 +35,8 @@
    for the new <a href="https://apps.apple.com/de/app/swift-playgrounds/id1496833156?mt=12">Playgrounds</a> App on macOS 👨‍💻
 </p>
 
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 <p align="center">
    <img src="https://raw.githubusercontent.com/SvenTiigi/SwiftPlaygroundsCLI/gh-pages/readme-assets/Demo.png" width="90%" alt="Demo">
 </p>