Add comprehensive Spanish description explaining repository content

[Copilot]

Problem

The repository lacked a proper description in Spanish explaining "De qué es este repositorio" (What is this repository about?). The README.md only contained a brief English title without context about the mathematical content, structure, or purpose of the work.

Solution

Updated the README.md with a comprehensive Spanish description that includes:

• Clear explanation of the repository's purpose: mathematical research on the well-posedness of the modified nonlinear Zakharov-Kuznetsov-Burgers equation
• Mathematical context including the PDE equation and its relevance in physics and fluid mechanics
• Document structure explaining the preliminaries and main theoretical results
• File descriptions for all main components (LaTeX files, bibliography, etc.)
• Author information from Universidad Nacional de Colombia
• Bilingual approach maintaining the original English summary for international accessibility

Key Features of the Updated Description

### Objetivos del trabajo:
- Demostrar la existencia y unicidad de soluciones locales
- Estudiar la dependencia continua de las soluciones respecto al dato inicial
- Analizar la buena colocación en espacios de Sobolev periódicos H^s(𝕋^n)

The description now properly explains that this is a rigorous mathematical study focusing on:

• Existence and uniqueness of local solutions
• Continuous dependence on initial data
• Well-posedness in periodic Sobolev spaces

This addresses the user's question by providing a complete understanding of the repository's mathematical content and academic purpose.

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