Add HDDTemp docs (#1358)

source/_components/sensor.hddtemp.markdown

@@ -0,0 +1,36 @@
+---
+layout: page
+title: "HDDTemp"
+description: "Instructions how to integrate harddrive temperature information into Home Assistant."
+date: 2016-10-28 07:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: System Monitor
+ha_release: 0.32
+ha_iot_class: "Local Polling"
+---
+
+The `hddtemp` sensor platform is using the data provided by [HDDTemp](http://savannah.nongnu.org/projects/hddtemp).
+
+It required that `hddtemp` is started or running in daemon mode on a local or remote system.
+
+```bash
+$ hddtemp -dF
+```
+
+To setup a HDDTemp to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: hddtemp
+```
+
+Configuration variables:
+
+- **name** (*Optional*): Friendly name to use for the frontend. Default to "HD Temperature".
+- **host** (*Optional*): Host where `hddtemp` is running. Default to `localhost`.
+- **port** (*Optional*): Port that is used by `hddtemp` . Default to `7634`.
+