Add GitHub Actions workflow for automated releases - #3

This PR adds a complete GitHub Actions workflow that automatically generates releases when version tags are pushed to the repository.

What's New

🚀 Automated Release Workflow

• Trigger: Automatically runs when a git tag starting with 'v' is pushed (e.g., v1.0.0, v2.1.3)
• Cross-platform builds: Creates binaries for 6 different platform/architecture combinations:
  • Linux (AMD64, ARM64)
  • macOS (AMD64, ARM64) - Intel and Apple Silicon
  • Windows (AMD64, ARM64)
• GitHub Releases: Automatically creates releases with:
  • Auto-generated release notes
  • All built binaries attached as downloadable assets
  • Proper semantic versioning support

📚 Enhanced Documentation

• README.md: Added section about downloading pre-built binaries for end users
• RELEASES.md: New maintainer guide explaining the release process
• Updated .gitignore: Excludes build artifacts from version control

How It Works

For maintainers creating a release:

git tag v1.0.0
git push origin v1.0.0

For users: Visit the Releases page and download the appropriate binary for your platform - no need to build from source!

Benefits

• Zero-maintenance releases: Just push a tag and everything happens automatically
• Better user experience: Users can download pre-built binaries instead of requiring Go toolchain
• Cross-platform support: Covers all major operating systems and architectures
• Professional presentation: Clean releases with auto-generated notes and organized assets

The workflow uses GitHub Actions best practices with proper permissions, trusted actions (checkout@v4, setup-go@v5, action-gh-release@v2), and follows semantic versioning conventions.

Closes the issue requesting automated release generation.

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