Added initial documentation to Melnor Raincloud component (#3304)

* Added initial documentation to Melnor Raincloud component

* Added scan interval option on the docs

* Upgraded Raincloud docs to release 0.54

* Upgraded Raincloud docs to release 0.55

* Moved watering_minutes to switch componenet

source/_components/binary_sensor.raincloud.markdown

@@ -0,0 +1,30 @@
+---
+layout: page
+title: "Melnor Raincloud Binary Sensor"
+description: "Instructions on how to integrate your Melnor Raincloud sprinkler system within Home Assistant."
+date: 2017-09-04 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: raincloud.jpg
+ha_category: Binary Sensor
+ha_release: "0.55"
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Melnor RainCloud](https://wifiaquatimer.com) binary sensors working within Home Assistant, please follow the instructions for the general [Raincloud component](/components/raincloud).
+
+Once you have enabled the [Raincloud component](/components/raincloud), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+binary_sensor:
+  - platform: raincloud
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Optional*): Conditions to display in the frontend. If not specified, all conditions below will be enabled by default. The following conditions can be monitored.
+  - **is_watering**: Return if is currently watering per zone.
+  - **status**: Return status from the Melnor RainCloud Controller and Melnor RainCloud Faucet.