✨ Set up Copilot instructions with BYOK support and DOCX file format for AI book reader repository

[Copilot]

This PR implements Copilot instructions for the ai-book-reader repository following GitHub's best practices for coding agent guidance.

What was added

Created .github/copilot-instructions.md with comprehensive guidance covering:

• Project Overview: Clear description of the AI-assisted book reader application and its purpose
• Development Guidelines: Code style standards, meaningful naming conventions, and documentation requirements
• Architecture Principles: Modular design patterns, separation of concerns, and scalability considerations
• AI Integration Best Practices: Error handling for AI services, rate limiting, privacy protection, fallback mechanisms, and BYOK (Bring Your Own Key) support for OpenAI API keys
• Testing Standards: Unit testing requirements, edge case coverage, and AI component testing
• Security Considerations: Input sanitization, file handling security, API key protection, and secure user API key management
• Repository-Specific Guidance:
  • Multi-format book processing (PDF, EPUB, TXT, DOCX)
  • AI features like smart bookmarking and text analysis
  • User-configurable OpenAI API keys with secure UI management
  • UI/UX considerations for readability and accessibility
  • Performance optimization for large document handling

Key Features Added

• BYOK Support: Users can provide their own OpenAI API keys for enhanced privacy and cost control
• API Key Security: Comprehensive guidelines for secure storage using environment variables or encrypted storage
• User Interface: Clear requirements for API key management UI with proper security warnings
• Privacy Protection: Never log or expose user-provided API keys in plain text
• DOCX File Support: Added support for Microsoft Word document format alongside PDF, EPUB, and TXT files

Why this matters

These instructions will help GitHub Copilot provide more contextually relevant code suggestions and ensure consistent development practices across all contributors. The guidance is specifically tailored for an AI-powered reading application, addressing unique challenges like file processing, AI service integration, user-controlled API key management, and user experience optimization.

The instructions follow GitHub's recommended structure and provide clear, actionable guidance that will improve code quality and development velocity for this project while ensuring user privacy and security.

Closes #1

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #6

---

💡 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.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
ai-book-reader	Error			Oct 2, 2025 3:15pm

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Note

Other AI code review bot(s) detected

CodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review.

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[charx0r]

Add the ability to support .docx files

[charx0r]

@copilot

[Copilot]

Added DOCX file format support to the Copilot instructions. The file processing guidance now includes support for PDF, EPUB, TXT, and DOCX formats, ensuring comprehensive document compatibility for the AI book reader application. Commit: e577e38