Run phelp as a daemon service

[Akarshit]

Instead of just starting the script, install the phelp as a daemon service.

The users can stop the service with something like sudo service phelp stop. Similar for start and restart. We are trying to imitate how most of the daemon services are run on linux.

The platform dependency needs to be checked before implementing this.

The phelp command should remain as it is. Also it might be better to add alias 'sudo phelp stopforsudo service phelp stop`