Add additional service setup steps to Readme

[lehighkid]

Thank you for coding this and the simple directions; however, in order to get it to function correctly, I had to take these additional steps:

1. sudo update-rc.d DashScanner defaults
2. sudo update-rc.d DashScanner enable

Otherwise "sudo service DashScanner start" failed with "Failed to start DashScanner.service: Unit DashScanner.service failed to load: No such file or directory."

Thanks again!

[kerber]

Hey lehighkid,
Thanks for the update! Also, what Linux distribution are you running?

[lehighkid]

Raspbian Jessie