Update getting started

source/getting-started/autostart-macos.markdown

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+---
+layout: page
+title: "Autostart on macOS boot"
+description: "Instructions how to setup Home Assistant to launch on macOS boot."
+date: 2015-9-1 22:57
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Setting up Home Assistant to run as a background service is simple. OS X will start it on boot and make sure it's always running.
+
+To get Home Assistant installed as a background service, run:
+
+
+```bash
+$ hass --install-osx
+
+Home Assistant has been installed.         Open it here: http://localhost:8123
+```
+
+Home Assistant will log to `~/Library/Logs/homeassistant.log`
+
+To uninstall the service, run:
+
+```bash
+$ hass --uninstall-osx
+
+Home Assistant has been uninstalled.
+```