Rewrite README for clarity and verified repository structure

[SueJianjian]

Summary

This PR rewrites README.md for clarity and readability.

What changed

• fixed garbled and inconsistent text
• reorganized sections for easier scanning
• aligned the documented repository structure with the actual source tree
• kept the README focused on real, verifiable paths and entry points

Verification answer

I verified the repository structure directly from source.

The repo contains:

• chain/
• docs/
• .github/
• multiple api-*.js files
• many root-level .html pages including index.html, whitepaper.html, governance.html, mia.html, and ltd-token-economics.html

Scope

README-only change.

[github-actions]

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[github-actions]

Welcome @SueJianjian!

Thanks for your first PR to La Tanda.

Before review, please confirm:

• I read the Codebase Patterns section in CONTRIBUTING.md
• Auth token uses localStorage.getItem('auth_token') (not sessionStorage or other keys)
• All user data in HTML uses escapeHtml()
• UI text is in Spanish, code comments in English
• API endpoints verified against Swagger UI
• I modified existing files (not created standalone scripts)

Resources

• CONTRIBUTING.md — Codebase patterns and rules
• Swagger UI — API documentation (220+ endpoints)
• Dev Portal — Interactive sandbox and SDK examples

A maintainer will review your PR within 24-48 hours.

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