Getting started using an IKEA outlet?
Please forgive me for filing this, I just am unable to figure out how to get started using your library which seems awesome!

**Setup**
I'm running on `zigbee2mqtt` 1.16.2 through docker. Previously I had a working setup using deCONZ + Homebridge Hue, but I wanted to mix it up again since it seems like z2m has evolved very nicely over the past year.

I'm on a fresh setup and just added a single IKEA control outlet (E1603/E1702) to z2m. It sets up successfully:

```
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:11: Device '0x000d6ffffe7cb852' joined
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:11: Starting interview of '0x000d6ffffe7cb852'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:11: MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"message":{"friendly_name":"0x000d6ffffe7cb852"},"type":"device_connected"}'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:11: MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"message":"interview_started","meta":{"friendly_name":"0x000d6ffffe7cb852"},"type":"pairing"}'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:26: Successfully interviewed '0x000d6ffffe7cb852', device has successfully been paired
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:26: Device '0x000d6ffffe7cb852' is supported, identified as: IKEA TRADFRI control outlet (E1603/E1702)
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:26: Configuring '0x000d6ffffe7cb852'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:26: MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"message":"interview_successful","meta":{"description":"TRADFRI control outlet","friendly_name":"0x000d6ffffe7cb852","model":"E1603/E1702","supported":true,"vendor":"IKEA"},"type":"pairing"}'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:25:26: Successfully configured '0x000d6ffffe7cb852'
zigbee2mqtt    | Zigbee2MQTT:info  2020-12-05 11:26:08: MQTT publish: topic 'zigbee2mqtt/bridge/config/devices', payload '[{"dateCode":"0x26660700","friendly_name":"Coordinator","ieeeAddr":"0x00212effff054339","lastSeen":1607196368683,"networkAddress":0,"softwareBuildID":"ConBee2/RaspBee2","type":"Coordinator"},{"dateCode":"20180528","description":"TRADFRI control outlet","friendly_name":"0x000d6ffffe7cb852","hardwareVersion":1,"ieeeAddr":"0x000d6ffffe7cb852","lastSeen":1607196326506,"manufacturerID":4476,"manufacturerName":"IKEA of Sweden","model":"E1603/E1702","modelID":"TRADFRI control outlet","networkAddress":6447,"powerSource":"Mains (single phase)","softwareBuildID":"1.4.020","type":"Router","vendor":"IKEA"}]'
```

Based on the instructions in the readme, I gathered the device identifier and put it into my homebridge config as a device:

```
{
    "mqtt": {
        "base_topic": "zigbee2mqtt",
        "server": "<server>",
        "user": "<username>",
        "password": "<password>",
        "reject_unauthorized": false,
        "keepalive": 60,
        "version": 4
    },
    "devices": [
        {
            "id": "0x000d6ffffe7cb852"
        }
    ],
    "platform": "zigbee2mqtt"
}
```

I checked the homebridge logs for homebridge-z2m, and found a few logs:

```
[12/5/2020, 11:26:08 AM] [zigbee2mqtt] Connected to MQTT server
[12/5/2020, 11:26:08 AM] [zigbee2mqtt] New accessory: 0x000d6ffffe7cb852
[12/5/2020, 11:26:08 AM] [zigbee2mqtt] Publish to 'zigbee2mqtt/0x000d6ffffe7cb852/get': '{}'
```

However, the outlet doesn't show up in homebridge as a device. I tried restarting it a few times to no avail.

I feel like I'm probably missing something. I'm unsure whether I need to somehow fill in the capabilities of the device in my config? Or how I might even do that. Maybe I'm missing something obvious in the documentation, and if so please feel free to tell me to RTFM. 😄 

**Versions used**
 - This plugin: v0.0.10
 - Homebridge: v1.2.3
 - Zigbee2mqtt: v1.16.2
 - Homebridge Config UI X: v4.35.0
