Add GitHub Copilot instructions file

[Copilot]

Creates .github/copilot-instructions.md to guide GitHub Copilot and developers on project conventions.

File Structure

• General Principles: Ask-before-assuming policy, code quality standards
• Coding Standards: Style guidelines, naming conventions, error handling
• Testing Requirements: Coverage expectations, test quality, AAA pattern
• Documentation: JSDoc/docstrings, README maintenance, inline comments
• Architecture: Project structure, design patterns, performance considerations
• Git Workflow: Commit conventions, PR guidelines, branch management
• Security: Input sanitization, secrets management, authentication patterns
• Collaboration: Code review expectations, communication guidelines
• Accessibility: WCAG compliance, semantic HTML, ARIA labels
• Performance: Bundle optimization, caching strategies, profiling

The file emphasizes asking clarifying questions before implementation and provides actionable, specific guidance across all development activities.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create Copilot Instructions File</issue_title>
<issue_description>## Objective
Check if a Copilot instruction file exists in the repository, and if not, create one with best practices.

Tasks

• Search for existing Copilot instruction files in the following locations:
  • .github/copilot-instructions.md
  • .github/copilot.md
  • Root-level instruction files
• If no file exists, create .github/copilot-instructions.md with:
  • Project-specific context and conventions
  • Coding standards and style guidelines
  • Testing requirements
  • Documentation expectations
  • Architecture patterns used in the project
  • Any clarifying questions policy (e.g., "ask clarifying questions before building plans")
• Create a pull request with the new instruction file

Acceptance Criteria

• Instruction file is placed in .github/copilot-instructions.md
• File contains relevant, actionable guidelines for the project
• PR is created and ready for review</issue_description>

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

• Fixes Create Copilot Instructions File #1

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