docs: add Spanish README

[webbrain-one]

Adds README.es-ES.md alongside the original documentation.

Summary by CodeRabbit

• Documentation
  • Added a Spanish README describing the repository’s topics, including FinTech, blockchain, Web3, AI, books, and German.
  • Added navigation links and guidance for viewing the content with Obsidian.
  • Included macOS instructions for converting Markdown files to DOCX with Pandoc.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 25d2088e-5579-41f2-b2e1-65b390eacaf0

📥 Commits

Reviewing files that changed from the base of the PR and between 98c6e30 and ad7a88e.

📒 Files selected for processing (1)

• README.es-ES.md

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📝 Walkthrough

Walkthrough

Se añadió un README en español. El documento describe las categorías del repositorio, recomienda Obsidian para visualizar las notas y explica cómo convertir archivos Markdown a DOCX con Pandoc en macOS.

Changes

Documentación en español

Layer / File(s)	Summary
Contenido y herramientas del README README.es-ES.md	El README presenta las categorías del repositorio, incluye enlaces de navegación, describe el uso de Obsidian y documenta la conversión de Markdown a DOCX con Pandoc en macOS.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the addition of the Spanish README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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