Add documentation for verifying signatures of binary releases

Summary

The project would benefit from documentation explaining how to verify the cryptographic signatures of binary releases to ensure their authenticity and integrity.

Problem Statement

Currently, users downloading binary releases from this project lack clear guidance on:

• How to verify that releases are authentic and haven't been tampered with
• What signature files or checksums are available
• The specific steps needed to perform signature verification
• Which tools are required for verification

This creates a security gap where users may unknowingly install compromised binaries.

Proposed Solution

Add documentation that covers:

Essential Information

• Available verification methods (GPG signatures, checksums, etc.)
• Required tools and how to install them
• Step-by-step verification instructions for different operating systems
• Public key information (if using GPG) including:
  • Key ID and fingerprint
  • Where to obtain the public key
  • How to import and verify the key

Documentation Locations

• Add a "Verifying Releases" section to the main README
• Include verification instructions in release notes
• Consider a dedicated SECURITY.md file with detailed verification procedures