Add loop energy docs

source/_components/sensor.loop_energy.markdown

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+---
+layout: page
+title: "Loop Energy"
+description: "Instructions how to integrate Loop Energy devices within Home Assistant."
+date: 2016-04-02 22:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: loop.png
+ha_category: Sensor
+---
+
+
+Integrate your [Loop Energy](https://www.your-loop.com/) meter information into Home Assistant.
+
+To enable the Loop Energy sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: loopenergy
+  electricity_serial: ELECRITCAL_SERIAL
+  electricity_secret: ELECTRICAL_OFFSET
+  gas_serial: GAS_SERIAL
+  gas_secret: GAS_SECRET
+```
+
+Configuration variables:
+
+- **electricity_serial** (*Required*): Serial of your electricity sensor
+- **electricity_secret** (*Required*): Secret for your electricity Sensor 
+- **gas_serial** (*Required*): Serial for your gas sensor.
+- **gas_secret** (*Required*): Secret for your gas sensor.
+