This issue proposes the creation of a comprehensive guide for setting up and using Composer in the phalcon/rest-api-v6 project. The documentation should cover:

• Initial Composer installation steps
• Required packages: phalcon v6, dotenv, phinx, JWE/JWT package
• Example composer.json configuration
• Usage instructions for installing, updating, and managing dependencies
• Any project-specific caveats or tips

This will help developers quickly bootstrap new environments and ensure consistency in dependency management.