docs: add Spanish README

[webbrain-one]

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

Summary by Sourcery

Documentation:

• Introduce README.es-ES.md providing a Spanish translation of the main project README.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a Spanish-language README (README.es-ES.md) that mirrors the core project description and star history badge from the main documentation, providing localized information for Spanish-speaking users.

File-Level Changes

Change	Details	Files
Introduce a Spanish version of the project README to localize core documentation content.	Create README.es-ES.md with a Spanish description of the Pycortex surface database for NSD subjects. Include explanation of overlays.svg files and ROI labels in Spanish to match the purpose of the original README. Embed the same Star History chart badge as in the primary README to keep visual/project metadata consistent.	README.es-ES.md

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider mirroring the full structure and sections of the original README so Spanish-speaking users get the same level of detail and guidance as the main documentation.
• The locale code in the filename (README.es-ES.md) is very specific; if you don't rely on region-specific variants elsewhere, you might simplify to README.es.md for consistency and easier discovery.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider mirroring the full structure and sections of the original README so Spanish-speaking users get the same level of detail and guidance as the main documentation.
- The locale code in the filename (`README.es-ES.md`) is very specific; if you don't rely on region-specific variants elsewhere, you might simplify to `README.es.md` for consistency and easier discovery.

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