Sample configuration files for:
```
SystemD: agrariand.service
Upstart: agrariand.conf
OpenRC:  agrariand.openrc
         agrariand.openrcconf
CentOS:  agrariand.init
macOS:    org.agrarian.agrariand.plist
```
have been made available to assist packagers in creating node packages here.

See doc/init.md for more information.
