Update README with project assets link

Added a link to the project assets in the README.

README.md

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 **Frontend Slides** helps non-designers create beautiful web presentations without knowing CSS or JavaScript. It uses a "show, don't tell" approach: instead of asking you to describe your aesthetic preferences in words, it generates visual previews and lets you pick what you like.
 
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+https://github.com/user-attachments/assets/ef57333e-f879-432a-afb9-180388982478
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 ### Key Features
 
 - **Zero Dependencies** — Single HTML files with inline CSS/JS. No npm, no build tools, no frameworks.