Merge pull request #54 from shinpr/feat/add-hashnode-article-en

docs: Add Hashnode article link to English README

Author: shinpr

README.md

@@ -205,6 +205,12 @@ graph TD
     G -->|No| H[Complete]
 ```
 
+## 💡 Practical Guide
+
+[Zero Context Exhaustion: Building Production-Ready AI Coding Teams with Claude Code Sub-agents](https://shinpr.hashnode.dev/zero-context-exhaustion-building-production-ready-ai-coding-teams-with-claude-code-sub-agents)
+
+A comprehensive guide explaining how this boilerplate works and why it's designed this way. Covers the implementation background of Sub agents and Context Engineering, with real-world examples showing 770K tokens processed without exhaustion.
+
 ## 📋 Development Rules Overview
 
 ### Core Principles