Added Netgear Arlo documentation (#2726)

source/_components/arlo.markdown

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+---
+layout: page
+title: "Arlo"
+description: "Instructions on how to integrate your Netgear Arlo cameras within Home Assistant."
+date: 2017-05-30 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: arlo.png
+ha_category: Hub
+ha_release: 0.46
+---
+
+The `arlo` implementation allows you to integrate your [Arlo](https://arlo.netgear.com/) devices in Home Assistant.
+
+To enable device linked in your [Arlo](https://arlo.netgear.com/) account, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+arlo:
+  username: you@example.com
+  password: secret
+```
+
+Configuration variables:
+
+- **username** (*Required*): The username for accessing your Arlo account.
+- **password** (*Required*): The password for accessing your Arlo account.
+
+It is recommended to create a dedicated user on Arlo website to be used within Home Assistant and then share your Arlo cameras.
+
+Finish its configuration by visiting the [Arlo sensor page](/components/sensor.arlo/) or [Arlo camera page](/components/camera.arlo/).

source/_components/camera.arlo.markdown

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+---
+layout: page
+title: "Arlo Camera"
+description: "Instructions how to integrate your Netgear Arlo cameras within Home Assistant."
+date: 2016-05-30 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: arlo.png
+ha_category: Camera
+ha_release: 0.46
+---
+
+To get your [Arlo](https://arlo.netgear.com/) sensors working within Home Assistant, please follow the instructions for the general [Arlo component](/components/arlo).
+
+This component is not yet able to live stream from your Arlo camera, but it will be able to playback the last video capture.
+
+Once you have enabled the [Arlo component](/components/arlo), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+camera:
+  - platform: arlo
+    ffmpeg_arguments: '-pred 1 -q:v 2'
+```
+
+Configuration variables:
+
+- **ffmpeg_arguments**: (*Optional*): Extra options to pass to ffmpeg, e.g. image quality or video filter options.
+
+**Note:** To be able to playback the last capture, it is required to install the `ffmpeg` component. Make sure to follow the steps mentioned at [FFMPEG](https://home-assistant.io/components/ffmpeg/) documentation.

source/_components/sensor.arlo.markdown

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+---
+layout: page
+title: "Arlo Sensor"
+description: "Instructions on how to integrate your Netgear Arlo cameras within Home Assistant."
+date: 2017-05-30 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: arlo.png
+ha_category: Sensor
+ha_release: "0.46"
+---
+
+To get your [Arlo](https://arlo.netgear.com/) sensors working within Home Assistant, please follow the instructions for the general [Arlo component](/components/arlo).
+
+Once you have enabled the [Arlo component](/components/arlo), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: arlo
+    monitored_conditions:
+      - captured_today
+      - last_capture
+      - total_cameras
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Required*): Conditions to display in the frontend. The following conditions can be monitored.
+  - **captured_today**: Return the number of videos captured on the current day.
+  - **last_capture**: Return the timestamp from the last video captured by your Arlo camera.
+  - **total_cameras**: Return the number of recognized and active cameras linked on your Arlo account.
+
+If no **monitored_conditions** are specified, all of above will be enabled by default.