Add FreeDNS component (#5046)

* Add FreeDNS component

* Move the instructions up

source/_components/freedns.markdown

@@ -0,0 +1,49 @@
+---
+layout: page
+title: "freedns.afraid.org"
+description: "Keep your DNS record up to date with FreeDNS."
+date: 2018-03-27 21:30
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Utility
+ha_release: 0.67
+---
+
+With the `freedns` component you can keep your [FreeDNS](https://freedns.afraid.org) record up to date.
+
+## {% linkable_title Configuration %}
+
+You need to determine your update URL or your access token.
+
+1. Head over to the [FreeDNS](https://freedns.afraid.org) website and login to your account.
+2. Select the menu "Dynamic DNS"
+3. You should now see your update candiates in a table at the bottom of the page.
+4. Copy the link target of the "Direct URL".
+5. The access token is the part at the end of the link: `https://freedns.afraid.org/dynamic/update.php?YOUR_UPDATE_TOKEN`
+6. Either put the token as `access_token` _or_ the whole URL into the `url` attribute.
+
+To use the component in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+freedns:
+  access_token: YOUR_TOKEN
+```
+
+{% configuration %}
+  access_token:
+    description: Your access token. This is exclusive to `url`.
+    required: false
+    type: string
+  url:
+    description: The full update URL. This is exclusive to `access_token`.
+    required: false
+    type: string
+  update_interval:
+    description: How often to call the update service.
+    required: false
+    type: time period
+    default: 10 minutes
+{% endconfiguration %}

source/developers/development_guidelines.markdown

@@ -78,4 +78,4 @@ _LOGGER.error("No route to device: %s", self._resource)
 ```
 
 Don't print out wrong API keys, tokens, usernames, or passwords.
-
+Also note that `_LOGGER.info` is reserved for the core, use `_LOGGER.debug` in anything else.