Add preview to README

Author: dmaivel

README.md

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 # SharedGL ![license](https://img.shields.io/badge/license-MIT-blue)
 
 SharedGL is an OpenGL 4.6 implementation that enables 3D acceleration for Windows and Linux guests within QEMU/KVM by streaming OpenGL commands over shared memory or sockets.
 
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+<summary>Click to hide: Preview</summary>
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+![preview](https://github.com/user-attachments/assets/fbcd62ac-090d-4ad1-b37c-bd1f0432866a)
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 <details>
 <summary>Click to reveal: Table of contents</summary>