Simplepush docs (#926)

* Add Simplepush docs

* Use the actual length for a device key

source/_components/notify.simplepush.markdown

@@ -0,0 +1,38 @@
+---
+layout: page
+title: "Simplepush"
+description: "Instructions how to add Simplepush notifications to Home Assistant."
+date: 2016-09-11 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Notifications
+ha_release: 0.29
+---
+
+
+The `simplepush` platform uses [Simplepush](https://simplepush.io/) to delivery notifications from Home Assistant to your Android device.
+
+To add Simplepush to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+notify:
+  - name: NOTIFIER_NAME
+    platform: simplepush
+    device_key: ABCDE
+```
+
+Configuration variables:
+
+- **name** (*Optional*): Setting the optional parameter `name` allows multiple notifiers to be created. The default value is `notify`. The notifier will bind to the service `notify.NOTIFIER_NAME`.
+- **device_key** (*Required*): The device key of your device.
+
+To test if the service works, just send a message with `curl` from the command-line.
+
+```bash
+$ curl 'https://api.simplepush.io/send/device_key/title/message'
+```
+
+To use notifications, please see the [getting started with automation page](/getting-started/automation/).