Updated documentation with new sensor (#4094)

* Removed parts related to the component

* Component configuration

* Update rainbird.markdown

* Update rainbird.markdown

* Create sensor.rainbird.markdown

* Update sensor.rainbird.markdown

* Update rainbird.markdown

* Update sensor.rainbird.markdown

* Update sensor.rainbird.markdown

* Update sensor.rainbird.markdown

* Update rainbird.markdown

* Update sensor.rainbird.markdown

source/_components/rainbird.markdown

@@ -0,0 +1,33 @@
+---
+layout: page
+title: "Rain Bird"
+description: "Instructions on how to integrate your Rain Bird LNK WiFi Module within Home Assistant."
+date: 2017-12-07 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: rainbird.png
+ha_category: Hub
+ha_release: 0.61
+ha_iot_class: "Local Polling"
+---
+
+This `rainbird` component allows interacting with [LNK WiFi](http://www.rainbird.com/landscape/products/controllers/LNK-WiFi.htm) module of the Rain Bird Irrigation system in Home Assistant.
+
+To enable it, add the following to your `configuration.yaml` file:
+
+```yaml
+rainbird:
+  host: '1.1.1.1'
+  password: 'XXXXXXX'
+```
+
+Configuration variables:
+
+- **host** (*Required*): The IP address of your LNK WiFi Module.
+- **password** (*Required*): The password for accessing the module.
+
+Finish its configuration by visiting the [Rain Bird sensor](/components/sensor.rainbird/) and [Rain Bird switch](/components/switch.rainbird/) documentation.
+
+Please note that due to the implementation of the API within the LNK Module, there is a concurrency issue. For example, the Rain Bird app will give connection issues (like already a connection active).