How do I add a template to the "Create New Document" context menu in Nautilus [closed]

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http://askubuntu.com – Possible Duplicate: What is the “Templates” folder in the home directory for? I often want to start a new document in a folder I've navigated to in Nautilus. When I right-click, I can choose to create a new, empty document, and on top of that it says No templates installed I guess that implies that templates can be installed. My question is how do I add such a template? In particular, I would like to add a template for a new LibreOffice document and for a new LyX document. (HowTos)