Add table of contents

[nadvolod]

This pull request improves the README.md by making the documentation more user-friendly and easier to navigate. The main changes include reorganizing the setup instructions into clearly defined sections, adding a table of contents, and clarifying various steps with better formatting and examples.

Documentation improvements:

• Added a "Quick Start" section and a detailed "Table of Contents" to help users find information more easily.
• Reformatted setup and usage instructions by converting step headings (such as "Run with Python", "Hugging Face Token", etc.) into subsections with clearer explanations and consistent markdown formatting.
• Enhanced the "Review logs" section by providing an example log entry to clarify what users should expect to see after a successful model submission.