Readme for unsupported iletter package.

The document class iletter can be used to type letters according to 
Italian conventions. It is not an existing LaTeX document class, but 
a new one which used to be distributed with LyX. A template file is 
included in templates/ for you to use as a starting point.

Juergen Vigna <jug@lyx.org> wrote----------------------------------
I added this in old 0.12 times and also the supporting iletter.cls,
but I think now as I will not support this anymore and so it is
unsupported we should just remove this and the tex and template
files from the lyx distrib.
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Therefore, these files have been removed of the LyX distribution
as of LyX 1.2.1 and can be found here.
