add function to add local variables list to bottom of file

[Dan Jacobson]

Regarding this,
     ;;; Local Variables: ***
     ;;; mode:lisp ***
     ;;; comment-column:0 ***
     ;;; comment-start: ";;; "  ***
     ;;; comment-end:"***" ***
     ;;; End: ***
does emacs have a function to stick this in to our file or are we
required to do it by hand as an exercise each time?

Why doesn't emacs have a function that takes the current comment char,
and local variables list in effect, and make the above lines in the
bottom of our file when asked.  We the users would then edit out all
the lines except the ones we are interested in.  This would save a lot
of worry and guesswork about what if my format is not right, etc.
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