Add docs for the Eufy component (#5145)

* Add docs for the Eufy component

* Update version

* Update version

* Update version

source/_components/eufy.markdown

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+---
+layout: page
+title: "Eufy"
+description: "Instructions on how to integrate Eufy devices into Home Assistant."
+date: 2018-05-09 19:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: eufy.png
+ha_category: Hub
+ha_release: 0.68
+---
+
+The `eufy` component is the main component to integrate various [eufy](http://https://www.eufylife.com/) devices with Home Assistant.
+
+Supported devices will be discovered after the `eufy` component is configured:
+
+```yaml
+# Example configuration.yaml entry
+eufy:
+  username: testuser@domain
+  password: p4ssw0rd
+```
+
+where username and password are the ones configured in the EufyHome app. Alternately, Eufy devices that are not discoverable can be statically configured.
+
+```yaml
+eufy:
+  devices:
+    - address: 192.168.1.10
+      access_token: 1234567890abcdef
+      type: T1012
+      name: Smart Light
+    - address: 192.168.1.11
+      access_token: abcdef1234567890
+      type: T1201
+      name: Smart Switch
+```
+
+access_token can be obtained by running:
+
+```
+curl -H "Content-Type: application/json" -d '{"client_id":"eufyhome-app", "client_Secret":"GQCpr9dSp3uQpsOMgJ4xQ", "email":"USERNAME", "password":"PASSWORD"}' https://home-api.eufylife.com/v1/user/email/login | jq
+```
+
+replacing USERNAME and PASSWORD with the Eufy username and password. This will give an access_token. Then run:
+
+```
+curl -H token:TOKEN -H category:Home https://home-api.eufylife.com/v1/device/list/devices-and-groups | jq
+```
+
+replacing TOKEN with the access_token from the previous command. This will provide the local_code for each device.
+

source/_components/light.eufy.markdown

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+---
+layout: page
+title: "EufyLights"
+description: "Instructions on how to integrate Eufy LED lights into Home Assistant."
+date: 2018-05-09 19:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: eufy.png
+ha_category: Light
+ha_iot_class: "Local Polling"
+ha_release: 0.68
+---
+
+The `eufy` platform allows you to control your [Eufy](http://www.eufylife.com) lights from within Home Assistant.
+
+They will be automatically discovered if the [Eufy](/components/eufy/) component is enabled.
+

source/_components/switch.eufy.markdown

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+---
+layout: page
+title: "EufySwitch"
+description: "Instructions on how to integrate Eufy switches into Home Assistant."
+date: 2018-05-09 19:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: eufy.png
+ha_category: Switch
+ha_iot_class: "Local Polling"
+ha_release: 0.68
+---
+
+The `eufy` platform allows you to control your [Eufy](http://www.eufylife.com) switches from within Home Assistant.
+
+They will be automatically discovered if the [Eufy](/components/eufy/) component is enabled.
+