Identify and Implement Initial Routing (404 Page & Hello World)

[niden]

Identify and implement the initial routing setup for the phalcon/rest-api-v6 application.

Requirements:

• Define a route for the application's root ("/") that returns a simple "Hello World" response.
• Implement a catch-all route or error handler for 404 (Not Found) responses, returning a clear message or page.
• Document the initial routing structure and configuration, including where future routes should be added.

Benefits:

• Provides a starting point for further route development
• Improves developer onboarding and initial testing
• Ensures the application handles missing routes gracefully

[niden]

Implemented in #12