add slack page

source/components/notify.slack.markdown

@@ -0,0 +1,26 @@
+---
+layout: page
+title: "Slack notification support"
+description: "Instructions how to add Slack notifications to Home Assistant."
+date: 2015-08-06 18:00
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/slack.png' class='brand pull-right' />
+The slack platform allows you to deliver notifications from Home Assistant to [Slack](https://slack.com/).
+
+You need to obtain the [Slack API token](https://api.slack.com/web?sudo=1) to be able to send notifications.
+
+To enable the slack notification in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+notify:
+  platform: slack
+  api_key: ABCDEFGHJKLMNOPQRSTUVXYZ
+  default_channel: '#general'
+```
+