Description

This PR improves documentation, adds test coverage, and fixes a bug in the Creational patterns.

Changes

1. Chain of Responsibility: Added an "Examples in Python ecosystem" section (referencing Django Middleware) to patterns/behavioral/chain_of_responsibility.py to align with contribution guidelines.
2. Factory Pattern:
   • Created tests/creational/test_factory.py with unit tests for the Factory pattern (previously untested).
   • Fixed an IndentationError in patterns/creational/factory.py that was preventing execution.

Motivation

• To improve documentation quality and compliance.
• To increase test coverage and ensure the reliability of the Factory pattern implementation.
• To fix a syntax error in the existing codebase that was blocking usage.

Verification

• Ran python -m unittest tests/creational/test_factory.py and confirmed all tests passed.
• Verified docstring rendering locally.