Archive repository and add documentation

[sweep-ai[bot]]

Description

This PR archives the cea repository and adds documentation to provide information about the archival and where to find the latest and best check-in solutions for the cpdaily app.

Summary of Changes

• Modified the README.md file to add a notice about the repository being archived and provide instructions on where to find the latest and best check-in solutions for the cpdaily app.
• Created a new file named ARCHIVE.md to provide additional details about the archival of the repository and explain the reasons behind it.

Please review and merge this PR to archive the repository and provide the necessary documentation.

Fixes #59.

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[beetcb]

add the following content:

The author @beetcb currently has no relevant needs of check-in on the cpdaily app as he had already graduated. The open-source community definitely has the latest and best check-in solutions. I suggest searching for keywords such as "cpdaily" and "Today's Campus." If there are interested maintainers, welcome to become members of ceajs to maintain this project. Write the patched documentation in Chinese.