Add documentation for the mochad light component (#2976)

* Add documentation for the mochad light component

This commit adds docs for using x10 dimmers and lights via mochad.

* Update light.mochad.markdown

source/_components/light.mochad.markdown

@@ -0,0 +1,32 @@
+---
+layout: page
+title: "Mochad Light"
+description: "Instructions how to integrate X10 Mochad switches into Home Assistant."
+date: 2017-07-14 11:29
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Light
+ha_release: 0.51
+---
+
+The `mochad` switch platform lets you control an X10 enabled dimmer/light
+device.
+
+To enable this sensor, you first have to set up the [mochad component](/components/mochad/) and then add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yml entry
+light:
+  - platform: mochad
+    devices:
+      - address: a1
+      - address: a5
+```
+
+Configuration variables:
+
+- **address** (*Required*): The X10 address of the light.
+- **name** (*Optional*): The name of the switch. Default is: x10_light_dev_*address*.
+- **comm_type** (*Optional*): pl (powerline) or rf (radio frequency). Default is pl.