Created Domoticz - Automatic discovery (markdown)

Domoticz---Automatic-discovery.md

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+Sonoff supports automatic discovery by [Domoticz](http://www.domoticz.com/) through the [Domoticz MQTT Discovery plugin](https://github.com/emontnemery/domoticz_mqtt_discovery).
+
+## Prerequisites
+The following services should be made available:
+
+- You have installed/access to a MQTT broker server and made contact with your sonoff
+- You have installed Domoticz
+- You have installed the Domoticz MQTT Discovery plugin
+
+### Domoticz MQTT Discovery plugin
+Configure Domoticz MQTT Discovery plugin.
+
+- On the hardware page add Type ```MQTT Discovery```
+    1. Give it a name, e.g. ```Sonoff```
+    2. Configure the interface with access to your MQTT server (```MQTT Server Address```, ```Port```, ```Username``` and ```Password```)
+    3. Set the ```Discovery topic``` to ```homeassistant``` unless it has been changed in a custom Sonoff-Tasmota build
+    4. Set the ```Ignored device topic``` to ```tasmota/sonoff/``` to avoid unconfigured Sonoff-Tasmota devices from being discoved
+
+## Sonoff-Tasmota (official binary)
+- Each Sonoff-Tasmota device must have it's own topic, the easiest way is to set topic to ```sonoff_%06X``` (%06X will be replaced by MAC address). See point 5 [here](Initital-Configuration) for how to set the topic.
+- Use MQTT or Serial or Web console and execute commands (replace ```<sonoff_MAC>``` with the device's unique topic)
+    1. ```cmnd/<sonoff_MAC>/SetOpttion19``` with payload ```1``` to enable MQTT discovery
+
+## Sonoff-Tasmota (custom binary)
+- The above settings can be defined in user_config_override.h (TBD)
+
+## Usage    
+That's it! You will now find your Sonoff in the Domoticz user interface.
+
+- On the Switches page scroll down and find your Switch as configured in step 1
+    - Toggle the light bulb; Sonoff should respond
+