chore: add demo video

Added a link to the project assets in the README.

Author: exploIF

README.md

@@ -13,6 +13,10 @@
 
 `EnrichedTextInput`, the rich text editor component is an uncontrolled input. This means that it doesn't use any state or props to store its value, but instead directly interacts with the underlying platform-specific components. Thanks to this, the component is really performant and simple to use while offering complex and advanced features no other solution has.
 
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+https://github.com/user-attachments/assets/4778d541-d967-47e7-8013-6f7c436bcb95
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 Built by [Software Mansion](https://swmansion.com/) and sponsored by [Filament](https://filament.dm/).
 
 [<img width="128" height="69" alt="Software Mansion Logo" src="https://github.com/user-attachments/assets/f0e18471-a7aa-4e80-86ac-87686a86fe56" />](https://swmansion.com/)