Update README with GitHub assets link

Added a link to GitHub assets in the README.

Author: sbryngelson

README.md

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     <img src="docs/res/shockdrop.png" alt="Shock-droplet interaction simulated with MFC" width="700"/>
 </p>
 
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+https://github.com/user-attachments/assets/4847e4d1-50ff-4d08-828e-74219ffa1021
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 ## Why MFC?
 
 - **Exascale GPU performance** - Ideal weak scaling to 43K+ GPUs. Near compute-roofline behavior. [Compile-time case optimization](https://mflowcode.github.io/documentation/running.html) for up to 10x speedup.