Add lab for using 'Generate Instructions' and customizing .github/copilot-instructions.md

[SimmonsNeudesic]

Date: 2025-06-30
Update/Feature: Generate Custom Instructions
Brief Description: Agent mode can now auto-generate project-specific instructions.
Source Link: Release Notes
Gap Analysis: Supports best practices and onboarding gaps.
User Impact: Simplifies setup for new projects, improves consistency, and helps users adopt Copilot more effectively.
Recommendation Analysis: Add lab for using 'Generate Instructions' and customizing .github/copilot-instructions.md.
Priority: Medium
Labels: curriculum-gap, add-content, content, instructions, onboarding