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+# Mijn.Host DNS Updater – ACME Challenge Tool
+
+A minimal, fast .NET console application to create or update a single `_acme-challenge` TXT record via the Mijn.Host API v2.
+
+Perfect as a dns-01 challenge hook for Let’s Encrypt tools (Certbot, win-acme, acme.sh, Posh-ACME, etc.).
+
+## Features
+
+- Pure top-level console app – no DI container, no Host, no Singleton
+- API key safely loaded from `appsettings.json`
+- Fully async `HttpClient` with proper error handling
+- Strongly-typed records
+- Uses PATCH to add or replace exactly one DNS record
+- Tiny binary, zero external runtime dependencies beyond .NET runtime
+
+## Usage
+
+```bash
+MijnHost.exe example.com L5f...your-acme-challenge-token