Set up skeleton JSDocUtility plugin.

vim/scripts/JSDocUtility/
	-Add a directory for the JSDocUtility Vim plugin.

vim/scripts/JSDocUtility/README.md
	-Add a placeholder README.

vim/scripts/JSDocUtility/autoload/
(JSDocUtility, ftplugin/javascript).vim
	-Add skeleton functions/configuration. No functional content,
	yet.