readme: update with info for rpm based system, close #53
readme: update with info for rpm based system, close #53

romses/LXC-Web-Panel,romses/LXC-Web-Panel,romses/LXC-Web-Panel,claudyus/LXC-Web-Panel,claudyus/LXC-Web-Panel,claudyus/LXC-Web-Panel,claudyus/LXC-Web-Panel,romses/LXC-Web-Panel