Add 1-wire docs

source/_components/sensor.onewire.markdown

@@ -0,0 +1,25 @@
+---
+layout: component
+title: "One wire sensor"
+description: "Instructions how to integrate One wire (1-wire) sensors into Home Assistant."
+date: 2016-01-17 07:15
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Sensor
+---
+
+The `onewire` platform supports sensors which are using the One wire (1-wire) bus for communication.
+
+Supported devices:
+
+- [DS18B20}(https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf)
+
+To enable One wire sensors in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: onewire
+```