Add component collection

source/_components/shell_command.markdown

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+---
+layout: page
+title: "Shell command component"
+description: "Instructions how to integrate Shell commands into Home Assistant."
+date: 2015-10-13 19:10
+sidebar: false
+comments: false
+sharing: true
+footer: true
+ha_category: Other
+---
+
+<img src='/images/supported_brands/utilities-terminal.png' class='brand pull-right' />
+This component can expose regular shell commands as services.
+
+```yaml
+# Example configuration.yaml entry
+shell_command:
+  restart_pow: touch ~/.pow/restart.txt
+```
+
+Configuration variables:
+
+- Alias for the command and the command itself.
+