This pull request adds comprehensive and beginner-friendly documentation for React.memo and useMemo to enhance understanding of memoization in React. The new documentation includes:

1. Detailed explanations of what React.memo and useMemo are, their use cases, and when to apply them.
2. Practical examples demonstrating how to implement these features effectively in a React application.
3. Best practices for optimizing performance with memoization.
4. References to external resources and walkthrough videos for further learning.
5. This enhancement aims to support developers in leveraging memoization techniques to improve application performance and provide clarity on these important React features.