✨ Set up Copilot instructions for repository

[Copilot]

This PR implements comprehensive GitHub Copilot instructions for the Nexus-Singularity repository as requested. The new .github/copilot-instructions.md file provides detailed context about the project's unique philosophical and cosmic theme, technical architecture, and development patterns.

What's Added

Comprehensive Project Documentation:

• Project overview describing the philosophical/cosmic-themed single-page web application
• Technical architecture details (HTML5 with embedded CSS/JavaScript)
• Core design philosophy emphasizing cosmic aesthetics and interactive elements

Development Guidelines:

• Coding conventions for CSS (cosmic color schemes, animations), JavaScript (vanilla JS patterns), and HTML (semantic structure)
• Established design patterns using golden accents (#f4d03f, #f39c12) and cosmic gradients
• Responsive design principles with mobile-first approach

Domain Knowledge:

• Philosophical context around "elevated consciousness" and "intellectual liberation"
• User experience goals for creating contemplative digital spaces
• Cosmic/space-themed terminology conventions for consistent naming

Future Development Guidance:

• Placeholder function patterns for AI integration (openAIChat())
• Navigation system structure (enterNexus())
• Content management considerations for philosophical content

The instructions enable GitHub Copilot to provide contextually appropriate suggestions that maintain the project's unique aesthetic and philosophical character, ensuring all code contributions align with the established cosmic theme and technical patterns.

Fixes #14.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

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