Add random sensor docs (#1376)

source/_components/sensor.random.markdown

@@ -0,0 +1,32 @@
+---
+layout: page
+title: "Random Sensor"
+description: "Instructions how to integrate random number sensors into Home Assistant."
+date: 2016-10-30 12:10
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: home-assistant.png
+ha_category: Sensor
+ha_iot_class: "Local Polling"
+ha_release: 0.32
+---
+
+
+The `random` sensor platform is creating random sensor values (integers) out of a given range. This can be useful if you want to test automation rules. 
+
+To enable the random sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: random
+```
+
+Configuration variables:
+
+- **name** (*Optional*): Name of the sensor to use in the frontend. Defaults to `Random Sensor`.
+- **minimum** (*Optional*): Lower limit for the values. Defaults to `0`.
+- **maximum** (*Optional*): Upper limit for the values. Defaults to `20`.
+