Add Bangladesh domain extensions documentation

bangladesh-domains.md

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+# Bangladesh Domain Extensions (.bd)
+
+## Overview
+This document provides a comprehensive guide to Bangladesh's country code top-level domain (ccTLD) and its various second-level domain extensions.
+
+---
+
+## Primary Domains
+
+### National Domain
+- **`.bd`** — Bangladesh country code top-level domain
+- **`.বাংলা`** — Internationalized ccTLD in Bengali script
+
+---
+
+## Commercial & General Use
+
+| Domain | Purpose | Description |
+|--------|---------|-------------|
+| `.com.bd` | Commercial | Commercial organizations |
+| `.co.bd` | Company | Company / business use |
+| `.biz.bd` | Business | Business use |
+| `.info.bd` | Information | Informational websites |
+| `.net.bd` | Network | Network / ISP services |
+
+---
+
+## Organizations & Institutions
+
+| Domain | Purpose | Description |
+|--------|---------|-------------|
+| `.org.bd` | Non-profit | Non-profit organizations |
+| `.edu.bd` | Education | Educational institutions |
+| `.ac.bd` | Academic | Academic institutions |
+| `.sch.bd` | Schools | Schools |
+
+---
+
+## Government & Restricted
+
+| Domain | Purpose | Description | Access |
+|--------|---------|-------------|--------|
+| `.gov.bd` | Government | Government entities | Restricted |
+| `.mil.bd` | Military | Military entities | Restricted |
+
+---
+
+## Special / Identity / Media
+
+| Domain | Purpose | Description |
+|--------|---------|-------------|
+| `.id.bd` | Personal | Personal / identity-based domains |
+| `.tv.bd` | Television | Television / media-related use |
+| `.ai.bd` | AI/Tech | Artificial intelligence / tech branding |
+
+---
+
+## Quick Reference
+
+### By Category
+- **Commercial**: `.com.bd`, `.co.bd`, `.biz.bd`
+- **Information**: `.info.bd`, `.net.bd`
+- **Education**: `.edu.bd`, `.ac.bd`, `.sch.bd`
+- **Non-profit**: `.org.bd`
+- **Government**: `.gov.bd`, `.mil.bd` (restricted)
+- **Special Use**: `.id.bd`, `.tv.bd`, `.ai.bd`
+
+---
+
+*Last Updated: December 2024*