docs: refine and expand readme content

[kpeale]

Overview

This pull request updates the project’s README to make it clearer, more structured, and more helpful for new users and contributors. The goal is to improve overall accessibility, readability, and professionalism while keeping the original spirit of the project.

Changes Included

• Rewrote the introduction for clarity and purpose
• Organized the features section into clean categories
• Added quick usage examples
• Improved wording, grammar, and consistency throughout the file
• Enhanced readability with clearer markdown formatting

🎯 Why This Matters

A language/interpreter project is much easier to understand and contribute to when the documentation is clear. These changes help new users:

• Understand what Stroll is
• Try out features with examples
• Contribute with confidence

🤝 Additional Notes

If you'd like further enhancements—such as adding badges, screenshots, or a roadmap—I’m happy to contribute more.