Allow users to choose their own difficulty level

[thatvideoshopguy]

Introduce a feature that enables users to select a difficulty level when working on exercises to better tailor the learning experience to their individual needs.

Current Behaviour:

The repository currently offers a fixed set of exercises, which might not cater to the varying skill levels of users.

Proposed Feature:

• Add an option for users to choose their desired difficulty level (e.g. beginner, intermediate, advanced) before starting the exercises.
• Implement a set of exercises tailored to each difficulty level, ensuring that users have an appropriate learning experience based on their current skillset.

Benefits:

This feature will improve the overall user experience by providing a personalised learning path and ensuring that exercises are appropriate for each user's current skill level.