FreeDNS support (#173)

docs/freedns.md

@@ -0,0 +1,31 @@
+# FreeDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "freedns",
+      "domain": "domain.com",
+      "host": "host",
+      "id": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host (subdomain)
+- `"id"` is the ID you use to update your record
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup