add file page

source/components/notify.file.markdown

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+---
+layout: page
+title: "File notification support"
+description: "Instructions how to add file notifications to Home Assistant."
+date: 2015-06-22 10:00
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/text-x-generic.png' class='brand pull-right' />
+The file platform allows you to store notifications from Home Assistant as a file.
+
+To enable file notifications in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+notify:
+  platform: file
+  filename: FILENAME
+  timestamp: 1 or 0
+```
+
+Setting `timestamp` to 1 adds a timestamp to every entry. 
+
+To use notifications, please see the [getting started with automation page]({{site_root}}/components/automation.html).