Add Logi Circle component, camera and sensor platform documentation (#6249)

* Added documentation for the Logi component, camera platform and sensor platform.

* Updated Logi Circle camera and sensor platforms based on feature changes.

* Renamed `logi` component domain to `logi_circle`.

* Bumped HA release version to 0.79. Renamed logi brand image to logi_circle.

* Fixed typo. Removed redundant definition of last_activity_time sensor.

source/_components/camera.logi_circle.markdown

@@ -0,0 +1,69 @@
+---
+layout: page
+title: "Logi Circle Camera"
+description: "Instructions on how to integrate your Logi Circle cameras within Home Assistant."
+date: 2018-09-08 11:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: logi_circle.png
+ha_category: Camera
+ha_release: 0.79
+ha_iot_class: "Cloud Polling"
+---
+
+The `logi_circle` camera platform allows you to watch the still frames of your [Logi Circle](https://circle.logi.com/) camera's live stream in Home Assistant.
+
+<p class='note'>
+You must have the [Logi Circle component](/components/logi_circle/) configured to use this camera platform.
+</p>
+
+Logi Circle cameras support the `camera.turn_on` and `camera.turn_off` services. This will set the streaming mode property of your camera accordingly, controlling whether the live stream is available and activity recordings are captured.
+
+## {% linkable_title Configuration %}
+
+Once you have enabled the [Logi Circle component](/components/logi_circle), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+camera:
+  - platform: logi_circle
+```
+
+Configuration variables:
+
+- **scan_interval**: (*Optional*): How frequently to query for new camera stills. Defaults to 60 seconds.
+
+### {% linkable_title Service `camera.logi_circle_livestream_record` %}
+
+Initiates a recording of the camera's live stream. 
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Name(s) of entities to initiate a recording for, e.g., `camera.living_room_camera`. If blank, targets all Logi Circle cameras. |
+| `filename `            |      no  | Template of a file name. Variable is `entity_id`, e.g., {% raw %}`/tmp/snapshot_{{ entity_id }}.mp4`{% endraw %}. |
+| `duration`             |      no  | Duration of recording, in seconds.
+
+The path part of `filename` must be an entry in the `whitelist_external_dirs` in your [`homeassistant:`](/docs/configuration/basic/) section of your `configuration.yaml` file.
+
+### {% linkable_title Service `camera.logi_circle_livestream_snapshot` %}
+
+Take a snapshot from a camera's live stream. This differs from the generic [snapshot](/components/camera/#service-snapshot) service in that it sources the snapshot from the camera's live stream. For battery powered devices, this will wake your camera from sleep to perform this action.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Name(s) of entities to create a live stream snapshot from, e.g., `camera.living_room_camera`. If blank, targets all Logi Circle cameras. |
+| `filename`             |      no  | Template of a file name. Variable is `entity_id`, e.g., {% raw %}`/tmp/snapshot_{{ entity_id }}.jpg`{% endraw %}. |
+
+The path part of `filename` must be an entry in the `whitelist_external_dirs` in your [`homeassistant:`](/docs/configuration/basic/) section of your `configuration.yaml` file.
+
+### {% linkable_title Service `camera.logi_circle_set_config` %}
+
+Sets an configuration property for your camera.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Name(s) of entities to set the operation mode for, e.g., `camera.living_room_camera`. If blank, targets all Logi Circle cameras. |
+| `mode`                 |      no  | Configuration property to set. Allowed values: `BATTERY_SAVING`, `LED`, `PRIVACY_MODE` |
+| `value`                |      no  | Mode value. Allowed values: `true`, `false` |

source/_components/logi_circle.markdown

@@ -0,0 +1,40 @@
+---
+layout: page
+title: "Logi Circle"
+description: "Instructions on how to integrate your Logi Circle cameras within Home Assistant."
+date: 2018-09-08 11:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: logi_circle.png
+ha_category: Camera
+ha_release: 0.79
+ha_iot_class: "Cloud Polling"
+---
+
+The `logi_circle` implementation allows you to integrate your [Logi Circle](https://circle.logi.com/) cameras in Home Assistant.
+
+## {% linkable_title Configuration %}
+
+To integrate cameras linked with your [Logi Circle](https://circle.logi.com/) account, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+logi_circle:
+  username: YOUR_USERNAME
+  password: YOUR_PASSWORD
+```
+
+{% configuration %}
+username:
+  description: The username for accessing your Logi Circle account.
+  required: true
+  type: string
+password:
+  description: The password for accessing your Logi Circle account.
+  required: true
+  type: string
+{% endconfiguration %}
+
+Finish its configuration by visiting the [Logi Circle camera](/components/camera.logi_circle/) or [Logi Circle sensor](/components/sensor.logi_circle/) documentation.

source/_components/sensor.logi_circle.markdown

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+---
+layout: page
+title: "Logi Circle Sensor"
+description: "Instructions on how to integrate your Logi Circle cameras within Home Assistant."
+date: 2018-09-08 11:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: logi_circle.png
+ha_category: Camera
+ha_release: 0.79
+ha_iot_class: "Cloud Polling"
+---
+
+The `logi_circle` sensor platform lets you monitor sensors connected to your [Logi Circle](https://circle.logi.com) cameras in Home Assistant.
+
+<p class='note'>
+You must have the [Logi Circle component](/components/logi_circle/) configured to use this sensor platform.
+</p>
+
+## {% linkable_title Configuration %}
+
+Once you have enabled the [Logi Circle component](/components/logi_circle), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: logi_circle
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Optional*): Conditions to display in the frontend. The following conditions can be monitored. If not specified, all conditions supported by your camera will be enabled.
+  - **battery_level**: Return the battery level percentage from the camera.
+  - **last_activity_time**: Return the timestamp from the last time the Logi Circle camera detected any activity.
+  - **privacy_mode**: Return the privacy mode status from the camera. 
+  - **signal_strength_category**: Return the WiFi signal level from the camera.
+  - **signal_strength_percentage**: Return the WiFi signal percentage from the camera.
+  - **speaker_volume**: Return the relative speaker volume from the camera (0-100%).
+  - **streaming_mode**: Return the streaming mode status from the camera.
+
+Currently it supports all 1st and 2nd generation cameras. Cameras without an internal battery will not expose a `battery_level` sensor.