Adding README to explain inapt and packages

README

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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.
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+### inapt primer
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+`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.
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+`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.
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+### usage example
+
+```
+sudo inapt nodes.ia packages.ia # what you're going to do to update CSC machines
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+```
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+### inapt syntax examples
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+See nodes.ia for setting up of profiles, and packages.ia for the use of profiles to select package lists.
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+