added qbittorrent sensor documentation (#7597)

* added qbittorrent sensor documentation

* correction

* Minor changes

source/_components/sensor.qbittorrent.markdown

@@ -0,0 +1,52 @@
+---
+layout: page
+title: "qBittorrent Sensor"
+description: "Instructions on how to integrate qBittorrent sensors within Home Assistant."
+date: 2018-11-21 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: qbittorrent.png
+ha_category: Downloading
+ha_release: 0.84
+ha_iot_class: "Local Polling"
+---
+
+The `qbittorrent` platform allows you to monitor your downloads with [qBittorrent](https://www.qbittorrent.org/) from within Home Assistant and setup automations based on the information.
+
+## {% linkable_title Setup %}
+
+This sensor requires the qBittorrent Web UI enabled. The [official reference](https://github.com/qbittorrent/qBittorrent/wiki#webui-related) describes how to set up the Web UI.
+
+## {% linkable_title Configuration %}
+
+To enable this sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: qbittorrent
+    url: 'http://<hostname>:<port>'
+    username: YOUR_USERNAME
+    password: YOUR_PASSWORD
+```
+
+{% configuration %}
+url:
+  description: The URL of the Web UI of qBittorrent.
+  required: true
+  type: string
+name:
+  description: The name to use when displaying this qBittorrent instance.
+  required: false
+  type: string
+username:
+  description: The username of the Web UI of qBittorrent.
+  required: true
+  type: string
+password:
+  description: The password of the Web UI of qBittorrent.
+  required: true
+  type: string
+{% endconfiguration %}