Draft style guide for LibreOffice user guides

I have uploaded to English > Resources on Alfresco a draft style guide
(LibO-style-guide.odt) for the LibreOffice user guides. It includes,
among other things, the list of preferred terms that we had begun
compiling, and tips on writing style for authors, reviewers, and
editors. It was compiled from several documents, so it may be
inconsistent or duplicate some material, but it's ready for others to
review and comment on. Have fun!

--Jean