Rain Bird LNK WiFi Irrigation Implementation (#3242)

* Add Rainbird logo 

Add Rainbird logo

* Add Rainbird docset

Add Rainbird docset

* Added service description

Start and stop irrigation explaination

* Changed paramaters

* Corrected to official names

* Fixed more typos

* Added additional configuration documentation

* Corrected unnecessary line.

* Per discussion moved everything to switch

* Update switch.rainbird.markdown

* Not needed

source/_components/switch.rainbird.markdown

@@ -0,0 +1,46 @@
+---
+layout: page
+title: "Rain Bird Switch"
+description: "Instructions on how to integrate your Rain Bird LNK WiFi Module as Switches within Home Assistant."
+date: 2017-08-25 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: rainbird.png
+ha_category: Hub
+ha_release: 0.50
+ha_iot_class: "Local Polling"
+---
+
+This `rainbird` switch platform 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 stations as switches inside Home Assistant, add the following to your `configuration.yaml` file:
+
+```yaml
+switch:
+    platform: rainbird
+    host: '1.1.1.1'
+    password: 'secretpassword'
+    sprinkler_1:
+      zone: 1
+      friendly_name: "Front sprinklers"
+      trigger_time: 20
+      scan_interval: 10
+    sprinkler_2:
+      friendly_name: "Back sprinklers"
+      zone: 2
+      trigger_time: 20
+      scan_interval: 10
+```
+
+Configuration variables:
+
+- **stickip** (*Required*): The IP address of your LNK WiFi Module.
+- **password** (*Required*): The password for accessing the module.
+- **zone** (*Required*): Station zone identifier.
+- **friendly_name** (*Optional*): Just a friendly name for the station.
+- **trigger_time** (*Required*): The default duration to sprinkle the zone.
+- **scan_interval** (*Optional*): How fast to refresh the switch.
+
+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).