The ornamental design for a computingdevice, as shown and described.
FIG. 1 is a perspective view of a computing device according to my design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The doubled broken lines shown immediately adjacent to the solid lines in the figures represent the bounds of the claimed design, while all other broken lines are shown for environment only and form no part of the claimed design. The non-oblique shading is meant to show contour and not surface ornamentation.