[Rd] Package overview document?

[Duncan Murdoch]

I'm not sure if this is a devel or help question.

I'd like to write an overview of a package, and have it show up when
someone types

 library(help=mypackage)

or

 help(package=mypackage)

or even better, 

 ?mypackage

Right now, the first two give me a copy of the INDEX file; what I'd
like to see is a longer description.  Is it reasonable to write such a
description into the INDEX file?  Is there some other file where I can
put it, so that it will show up when someone asks about my package?

What about the latter version?  Wouldn't it be a nice improvement if
that were possible, too?

Duncan Murdoch
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