docs(contributor): contrib-readme-action has updated readme

Delete QSP-main

Update README.md

update README

Add files via upload

Implement adaptive resizing for secret images

Add functionality to calculate safe resolution for secret images based on cover image size and steganography density. Update asset locking process to adaptively resize secret images when necessary.

Change MAX_DIMENSION from 512 to 256

Reduced maximum dimension for image processing from 512 to 256.

Add说明.txt for storing generated keys