Add TCC project context and enhance LaTeX resources in README

[Copilot]

README lacked context about the completed TCC project. Future readers had no visibility into the system's purpose, implementation, or outcomes.

Changes

Added project context section (before existing content):

• Project overview: E2EE communication system using hybrid RSA/AES cryptography
• Motivation: Privacy protection against Man-in-the-Middle attacks and data breaches
• Technical implementation: Python, WebSocket, RSA-2048, AES-256, Perfect Forward Secrecy
• Results: Functional secure messaging platform with ephemeral key management
• Authors and keywords for discoverability

Enhanced LaTeX resources:

• Links: Added 10+ tools (Mathpix, Detexify, CTAN, LaTeX Wikibook, TeX Live, MiKTeX), organized by category
• Packages: Reorganized by function (Idioma, Formatação, Layout, Sumário, Referências), standardized CTAN URLs

Quality fixes:

• Corrected "identação" → "indentação"
• Standardized "Man-in-the-Middle" terminology

README expanded from 101 to 207 lines. Existing technical sections remain unchanged.

Original prompt

Atualize o README.md do projeto, mantenha as seções atuais (poerém atualize elas, atualizando os pacotes latex usados e sugerindo mais links úteis, ...), porém antes delas adicione uma contextualizações ao TCC, o tema abordado, perspectivas, objetivos, resultados, etc... Visto que concluímos o TCC agora basta atualizar o README para futuros leitores.

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