Adds documentation for the new Tautulli sensor. (#7151)

* Adds documentation for the new Tautulli sensor.

* Change "Plex" to "Tautulli" for the "ssl" option.

* Added link to API example

* added info about the user activity attribute.

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

* Update source/_components/sensor.tautulli.markdown

Co-Authored-By: ludeeus <joasoe@gmail.com>

source/_components/sensor.tautulli.markdown

@@ -0,0 +1,73 @@
+---
+layout: page
+title: "Tautulli activity sensor"
+description: "Instructions on how to set up Tautulli sensors in Home Assistant."
+date: 2018-10-27 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: tautulli.png
+ha_category: Sensor
+ha_release: 0.82
+ha_iot_class: "Local Polling"
+---
+
+The `Tautulli` sensor platform will monitor activity on a given [Tautulli Server][tautulli]. It will create a sensor that shows the number of currently active streams as the state. If you click the sensor for more details it will show you more statistics, the following stats are available by default:
+
+- LAN bandwidth
+- Number of direct plays
+- Number of direct streams
+- Stream count
+- Top Movie
+- Top TV Show
+- Top User
+- Total bandwidth
+- Transcode count
+- WAN bandwidth
+
+More user statistics can be added with the `monitored_variables` configuration option, this will add one attribute per user in addition to the users current `activity`.
+
+To find your `api_key` open the Tautulli web interface and navigate to `Settings` and then to `Web interface`, the `api_key` will be at the bottom of that page.  
+
+If you want to enable this sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: tautulli
+    api_key: 24b6eac0a858748664878d146bf63623b4
+    host: 192.168.1.14
+```
+
+{% configuration %}
+api_key:
+  description: The API key for your Tautulli server.
+  required: true
+  type: string
+host:
+  description: The DNS name or IP Address of the server running Tautulli.
+  required: true
+  type: string
+port:
+  description: The port of your Tautulli server.
+  required: false
+  default: 8181
+  type: integer
+ssl:
+  description: Use HTTPS to connect to Tautulli server. *NOTE* A host *cannot* be an IP address when this option is enabled.
+  required: false
+  default: false
+  type: boolean
+monitored_users:
+  description: A list of Tautulli users you want to monitor, if not set this will monitor **all** users.
+  required: false
+  type: list
+monitored_variables:
+  description: A list of attributes to expose for each Tautulli user you monitor, every key in the `session` [section here][tautulliapi] can be used.
+  required: false
+  type: list
+{% endconfiguration %}
+
+[tautulli]: https://tautulli.com
+[tautulliapi]: https://github.com/Tautulli/Tautulli/blob/master/API.md#get_activity