Add component collection

source/_components/downloader.markdown

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+---
+layout: page
+title: "Downloader"
+description: "Instructions how to setup the downloader component with Home Assistant."
+date: 2015-01-24 14:39
+sidebar: false
+comments: false
+sharing: true
+footer: true
+ha_category: Other
+---
+
+<img src='/images/supported_brands/emblem-downloads.png' class='brand pull-right' />
+The `downloader` component provides a service to download files. It will raise an error and not continue to set itself up when the download directory does not exist.
+
+To enable it, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+downloader:
+  download_dir: downloads
+```
+
+#### Service `downloader/download_file`
+
+Download the specified url.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `url`                  |       no | The url of the file to download.
+