Add radiotherm page

source/components/thermostat.radiotherm.markdown

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+---
+layout: page
+title: "Radiotherm thermostat support"
+description: "Instructions how to integrate Radiotherm thermostats within Home Assistant."
+date: 2015-10-18 17:15
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/radiotherm.png' class='brand pull-right' />
+The nest thermostat platform let you control a thermostat from [Radio Thermostat](http://www.radiothermostat.com/).
+
+The underlaying library supports:
+- CT50 V1.09
+- CT50 V1.88
+- CT50 V1.94 (also known as Filtrete 3M50)
+- CT80 Rev B2 V1.03
+
+To set it up, add the following information to your `configuration.yaml` file:
+
+```yaml
+thermostat:
+  platform: radiotherm
+  host: USERNAME
+  password: PASSWORD
+```
+
+Configuration variables:
+
+- **host** (*Required*): Your Radiotherm thermostat.
+