Create camera.mqtt.markdown (#2425)

* Create camera.mqtt.markdown

* Update camera.mqtt.markdown

source/_components/camera.mqtt.markdown

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+---
+layout: page
+title: "MQTT"
+description: "Instructions how to use an MQTT image message as a Camera within Home Assistant."
+date: 2017-04-14 00:45
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: mqtt.png
+ha_category: Camera
+ha_release: 0.43
+---
+
+The `mqtt` camera platform allows you to integrate the content of an image file sent through MQTT into Home Assistant as a camera. Everytime a message under the `topic` in the configuration is received, the image displayed in Home Assistant will also be updated.
+
+This can be used with an application or a service capable of sending images through MQTT, for example [Zanzito](https://play.google.com/store/apps/details?id=it.barbaro.zanzito).
+
+To enable this camera in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+camera:
+  - platform: mqtt
+    topic: zanzito/shared_locations/my-device
+```
+
+Configuration variables:
+
+ - **topic** (*Required*): MQTT topic to subscribe to.
+ - **name** (*Optional*): Name of the camera
+
+