Update README.md

README.md

 
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+### 🎨 Bolt Market Demo
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+![BoltMarketDemo](https://user-images.githubusercontent.com/7104693/94290571-3b238f80-ff0f-11ea-82f8-28233f747d3b.gif)
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+A more advanced demo featuring Bolt graphs for UI / dialouge, handling audio & animations, third person controls, scene management, working with Timeline, and more.
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+<br>
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 ### 🔜 Additional samples in the works!
 
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