The ornamental design for an armoire, as shown and described.
FIG. 1 is a front perspective view of a armoire showing my new design;
FIG. 2 is a side view, the opposite side view being a mirror image thereof
thereof; and,
FIG. 3 is a front view.
The broken lines showing the drawer and door hardware and the feet on the
armoire are for illustrative purposes only and form no part of the claimed
design.