Automatic Registration of Subclasses

# Introduction

In this project, you will learn how to implement a base class in Python that automatically registers its subclasses. This functionality can be useful in various scenarios, such as when working with database models or plugin-based architectures.

## 🎯 Tasks

In this project, you will learn:

- How to create a metaclass to control the class creation process
- How to implement the `__init_subclass__` method to automatically register subclasses
- How to make a class iterable by implementing the `__iter__` method

## 🏆 Achievements

After completing this project, you will be able to:

- Understand the concept of metaclasses and how they can be used to customize class behavior
- Implement a base class that automatically registers its subclasses
- Iterate over the registered subclasses of a base class