Create `systemd` Service

[she3o]

Feature Overview

Provide a systemd service file to manage the Zync server,
allowing it to run as a background service with automatic startup and management.

Requirements

• Develop a zync.service file compatible with systemd.
• Include configurations for service startup, shutdown, and restart behaviors.
• Allow customization of service parameters via environment variables or configuration files.
• Ensure the service handles logging appropriately.

Acceptance Criteria

• Users can install and enable the Zync service using standard Systemd commands.
• The service starts automatically on system boot.
• Logs are correctly managed by Systemd's journal or redirected as per configuration.

Implementation Suggestions

• Provide a sample zync.service file in the repository with documentation on installation.