Add warning about malicious forks claiming project discontinuation

[Copilot]

What is the purpose of this change?

Adds a prominent warning to README about forks falsely claiming bclone has been discontinued (e.g., jabiralam7/bclone-continued).

• Underlined alert section placed at top of README
• Emphasizes project is actively maintained
• Warns users to only download from official repository
• Mentions concerning fork by name without linking (avoids driving traffic)
• Clarifies forks were created in advance as a preemptive setup to inject malware at a later date

Was the change discussed in an issue or in the forum before?

This PR addresses the issue regarding malicious forks implying the project has been discontinued.

Checklist

• I have read the contribution guidelines.
• I have added tests for all changes in this PR if appropriate.
• I have added documentation for the changes if appropriate.
• All commit messages are in house style.
• I'm done, this Pull Request is ready for review :-)

Original prompt

update my readme to include a beware about possible malicious forks flying around (i.e. https://github.com/jabiralam7/bclone-continued) that imply this project has been discontinued - underline the project is still being maintained

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[BenjiThatFoxGuy]

@copilot update the phrasing to mention that it was forked in advance with them trying to imply it was discontinued - and that it's known it's a setup to shove malware into it later

[Copilot]

@copilot update the phrasing to mention that it was forked in advance with them trying to imply it was discontinued - and that it's known it's a setup to shove malware into it later

Updated the phrasing in commit 50a2e69 to clarify that these forks were created "in advance" and are "a known setup to inject malware at a later date."

[Copilot]

Pull request overview

This PR adds a prominent security warning to the README about malicious forks that falsely claim this project has been discontinued. The warning emphasizes that the project is actively maintained and advises users to only download from the official repository.

• Added a clearly visible warning section immediately after the disclaimer
• Included specific example of a malicious fork (jabiralam7/bclone-continued) without providing a direct link
• Clarified that these forks were created in advance as a setup to inject malware later

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