Create duckdns.markdown

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+---
+layout: page
+title: "Let's Encrypt"
+description: "Automatically update your Duck DNS ip address."
+date: 2017-04-30 13:28
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+[Duck DNS](https://duckdns.org/) is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice
+
+```json
+{
+  "token": "sdfj-2131023-dslfjsd-12321",
+  "domains": ["example.com", "mqtt.example.com", "hass.example.com"]
+}
+```
+
+Configuration variables:
+
+- **token** (*Required*): Your Duck DNS API key.
+- **domains** (*Required*): A list of domains to update dns.