Update README with MacOS security warning and complete binary list

[theapache64]

📝 Summary

This PR addresses issue #106 by updating the README with important MacOS security information and providing a complete list of available binaries.

🔄 Changes Made

✅ MacOS Security Warning

• Added notification about MacOS DMG file not being notarized
• Provided step-by-step instructions to resolve security warnings:
  1. Right-click the app and select "Open"
  2. Navigate to System Preferences → Security & Privacy
  3. Click "Open Anyway" next to the blocked app message

✅ Complete Binary List

• Updated download table to include ALL binaries from the latest release:
  • Linux: DEB package + JAR file
  • Windows: MSI installer + JAR file
  • MacOS: DMG installer + JAR files (both ARM64 and x64 variants)

✅ Improved Organization

• Restructured download table with Platform/Format columns for better clarity
• Added comprehensive installation notes section
• Maintained existing information about Java requirements and alternative builds

🎯 Fixes

Closes #106

📋 Testing

• Verified all download links point to latest release
• Confirmed README formatting renders correctly
• Validated security warning instructions are accurate