Add boilerplate : fiber-vertical-slice-architecture

[sebajax]

Added to README to contribute to the awesome Fiber framework.

• sebajax/go-vertical-slice-architecture - Vertical Slice Architecture code archetype using Fiber and Uber dig. A maintainable, and scalable code organization.

💡 Why Choose This Archetype?

Scalability: Seamlessly scale your application as your business grows.

Maintainability: Easily navigate through code and make changes without fear of unintended consequences.

Flexibility: Adapt to changing requirements and integrate new features effortlessly.

It uses Fiber has the main Framework with Uber dig for dependency injection

[gaby]

@sebajax Thanks for the PR