Add documentation for the RainMachine switch platform (#3135)

* Added documentation for the RainMachine switch platform

* Small adjustments to version and verbiage

* Update switch.rainmachine.markdown

* Update switch.rainmachine.markdown

* Added caveat about remote API + programs

source/_components/switch.rainmachine.markdown

@@ -0,0 +1,84 @@
+---
+layout: page
+title: "RainMachine Switch"
+description: "Instructions on how to use RainMachine units with Home Assistant."
+date: 2017-08-04 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: rainmachine.png
+ha_category: Switch
+ha_iot_class: "Cloud Polling"
+ha_release: 0.51
+---
+
+The `rainmachine` switch platform allows you to control programs and zones within
+a [RainMachine smart Wi-Fi sprinkler controller](http://www.rainmachine.com/).
+
+## {% linkable_title Configuring the Platform %}
+
+The platform allows for either local (i.e., directly across the LAN) or remote
+(i.e., through RainMachine's cloud API) access; the route you choose will
+dictate what your configuration should look like.
+
+For local access, specify the IP address/hostname of your RainMachine unit
+and your RainMachine password:
+
+```yaml
+switch:
+  platform: rainmachine
+  ip_address: 192.168.1.100
+  password: my_password_123
+```
+
+For remote access, specify your RainMachine username/email and password:
+
+```yaml
+switch:
+  platform: rainmachine
+  email: user@host.com
+  password: my_password_123
+```
+
+Configuration Variables:
+
+- **ip_address** (*Optional*): The IP address of your RainMachine unit
+- **email** (*Optional*): Your RainMachine username/email
+- **password** (*Required*): Your RainMachine password
+- **zone_run_time** (*Optional*): The number of seconds that a zone should run when
+turned on; defaults to 600 (10 minutes)
+
+## {% linkable_title Controlling Your Device %}
+
+After Home Assistant loads, you will see new switches for every enabled program
+and zone. These work as expected:
+
+- Program On/Off: starts/stops a program
+- Zone On/Off: starts/stops a zone (using the `zone_run_time` parameter to
+determine how long to run for)
+
+Programs and zones are linked. If a program is running its final zone, you will
+see both the program and zone switches turned on; turning either one off will
+turn the other one off (just like in the web app).
+
+## {% linkable_title Weblink %}
+
+If you would like to see and control more detailed information, create an [iFrame](/components/panel_iframe/) that renders the RainMachine web app:
+
+```yaml
+panel_iframe:
+  rainmachine:
+    title: RainMachine
+    url: "https://my.rainmachine.com/s/<YOUR_DEVICE_ID>/ui/"
+    icon: mdi:water-pump
+```
+
+You can find `<YOUR_DEVICE_ID>` by logging into [https://my.rainmachine.com](https://my.rainmachine.com ) and taking note of the URL.
+
+## {% linkable_title For Awareness %}
+
+The remote RainMachine API currently has two broken operations (i.e., they return
+error codes): starting a program and stopping a program. Please note that
+starting/stopping programs with the remote API is disabled until RainMachine
+can fix the issue.