Content audit: Identify missing topics and prioritized roadmap

[Copilot]

Repository has strong C# language coverage (15 topics, 7,162 lines) but lacks .NET platform essentials and modern development practices. Identified 25+ missing topics across 3 priority tiers.

Deliverables

• CONTENT_GAPS_ANALYSIS.md (Vietnamese): Detailed breakdown of all gaps, rationale, implementation checklist
• MISSING_TOPICS_SUMMARY.md (English): Executive summary with statistics and recommendations
• CONTENT_MAP.txt: Visual overview for quick scanning

Gap Summary

Phase 1 (HIGH - 9 topics): .NET platform essentials

• Memory Management & GC, Streams & I/O, Serialization
• Logging, Dependency Injection, Configuration, Testing
• Attributes, Reflection

Phase 2 (MEDIUM - 9 topics): Common development scenarios

• Networking, DateTime, RegEx, Expression Trees
• Performance, Design Patterns, ASP.NET/EF Core basics, Source Generators

Phase 3 (LOW - 7 topics): Specialized topics

• Interop, Assembly/Versioning, Dynamic, SOLID, NuGet, Build System, Code Analysis

Expansions (5 topics): Pattern Matching, Records, Span, Unsafe, Dynamic keyword

Impact

Current:    15 topics  │  7,162 lines  │  33% complete
After P1:   24 topics  │  ~10k lines   │  53% complete
After P2:   33 topics  │  ~13k lines   │  73% complete
Full:       45 topics  │  ~16k lines   │  100% complete

Each document includes actionable checklists and content templates for consistency with existing high-quality standards.

Original prompt

Do a comprehensive check for content. Suggest missing topics.

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