We claim the ornamental design for a computing device, as shown and described.
FIG. 1 is a top perspective view of a computing device;
FIG. 2 is an enlarged fragmentary perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a sectional view thereof taken along line 4-4 of FIG. 1; and,
FIG. 5 is a sectional view thereof taken along line 5-5 of FIG. 1.
The dash-dash broken lines in the drawings are environmental lines which do not form part of the claimed design. The short dash-long dash lines are boundary lines which do not form part of the claimed design. The shading represents a translucent glass material.