The ornamental design for a foldingshelf, as shown and described.
FIG. 1 is a front perspective view of a folding shelf showing our design in
the closed position.
FIG. 2 is a rear view of the folding shelf in the closed position.
FIG. 3 is a front perspective view of the folding shelf in the open
position.
The side edge of the folding shelf not shown is a mirror image of the side
edge shown in FIG. 1, while the bottom surface thereof is conventionally
flat and unornamented.