This PR adds detailed documentation and examples for the fve-dd tool to the dissect.fve project page, addressing the need for better guidance on unlocking encrypted volumes.

What's Added

Enhanced fve-dd Documentation:

• Clear description of what the tool does and which encryption types it supports
• Comprehensive examples showing different unlocking methods
• Explanations of when and how to use each method

BitLocker Examples:

• Unlocking with user passphrase
• Unlocking with recovery password
• Unlocking with .BEK files, including explanation that these are BitLocker External Key files typically stored on removable media

LUKS Examples:

• Unlocking with passphrase
• Unlocking with key files, with explanation of what LUKS key files contain
• Advanced usage with specific key slots (--key-slot)
• Advanced usage with key file offset and size parameters

Example Usage:

# BitLocker with .BEK file
$ fve-dd encrypted_volume.dd -f /path/to/recovery_key.BEK -o decrypted_volume.dd

# LUKS with key file
$ fve-dd encrypted_volume.dd -f /path/to/keyfile -o decrypted_volume.dd

All examples have been verified against the actual CLI interface to ensure accuracy. The documentation now provides the practical guidance requested for unlocking drives with both BitLocker .BEK files and LUKS key files.

Fixes #93. Fixes #92.

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