Add README file

Author: martin-martin

inheritance-and-composition/README.md

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+# Inheritance and Composition
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+This folder provides the code examples for the Real Python tutorial [Inheritance and Composition: A Python OOP Guide](https://realpython.com/inheritance-composition-python/).
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+Each of the folders contains the state of the code at the end of the three respective sections:
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+- **`inheritance/`**: [An Overview of Inheritance in Python](https://realpython.com/inheritance-composition-python/#an-overview-of-inheritance-in-python)
+- **`composition/`**: [Composition in Python](https://realpython.com/inheritance-composition-python/#composition-in-python)
+- **`choosing/`**: [Choosing Between Inheritance and Composition in Python](https://realpython.com/inheritance-composition-python/#choosing-between-inheritance-and-composition-in-python)