Adding README to explain inapt and packages

Gianni Gambetti 8 years ago
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These are the CSC's package lists. They should be used to keep all of the machines up to date, and limit installation differences between them.
### inapt primer
`inapt` is a wrapper around the `apt-get` tool for managing packages. It is used to group machines and the services that we want to have installed on them.
`inapt` takes a list of files, and builds up a package list for that machine. By default, it only activates the profile for the hostname of the machine, but accepts other profiles by having `--profile PROFILE` passed through the command line.
### usage example
sudo inapt nodes.ia packages.ia # what you're going to do to update CSC machines
### inapt syntax examples
See nodes.ia for setting up of profiles, and packages.ia for the use of profiles to select package lists.