Add table of contents to README for better navigation

[Dhie-boop]

What does this PR do?

• Adds a table of contents to the README file.
• Links to all major sections for easy navigation.

Why is this change needed?

• To improve the user experience for contributors and readers.
• Makes it easier to find relevant information quickly.

Checklist:

• Table of contents added with links.
• Verified that all links work correctly.
• Proofread for clarity.

Let me know if any changes are needed!

[Dhie-boop]

Thanks for the feedback.
I understand that 235 lines is manageable to scroll through. However, my intent with these changes was to standardize the layout across the repositories for a consistent user experience.
DeepSeek-V3 repository already uses this style, and I believe it benefits the overall documentation.

I'm open to suggestions, if there's a preferred way to achieve uniformity without the extra layout changes, please let me know. Otherwise, I think this consistency is valuable. Thanks!

[Dhie-boop]

Thank you for your feedback.
I appreciate your input. Please feel free to close the PR as suggested.