Update README.md

Author: codebysumit

README.md

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 This is a Mechanical Binary Counter Visualizer - an interactive educational web application that teaches binary arithmetic through realistic mechanical animations. The project simulates physical mechanical counters with flip animations, sound effects, and visual feedback to help users understand how binary counting works. Users can increment the counter, reset values, and observe how binary digits cascade and overflow in a mechanical fashion.
 
+[DEMO URL](https://github.com/codebysumit/bit-flip-counter/edit/master/README.md)
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 # User Preferences
 
 Preferred communication style: Simple, everyday language.