Create setup.sh that checks for and installs dependencies:
- Detects Java 11+ or offers to install via package manager
- Verifies Gradle wrapper presence
- Checks for unzip (needed for deployment)
- Runs test build to verify everything works
- Provides clear next steps after successful setup
Update readme with Quick Start section featuring setup script as the recommended approach for new systems.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
