Update README.md

Author: toyxyz

README.md

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+I slightly modified the script to allow users to upload keyframe images directly,
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+Pay attention to the name of the image file you upload. The video will be generated from the largest number to the smallest number. 
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+![image](https://github.com/user-attachments/assets/791e44e6-9ba1-4b72-962d-a38874db5f5f)
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+https://github.com/user-attachments/assets/978f5d7f-4316-4eef-be3c-f7b1a36e00af
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+
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+---------------------------------------------------------------------------------------------------
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 # Paints-Undo
 
 PaintsUndo: A Base Model of Drawing Behaviors in Digital Paintings