The ornamental design for footwear, as shown and described.
FIG. 1 is a front perspective view of a shoe showing my footwear design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a top view thereof.
The broken line showing of the heel, heel cap, sole, buckle, buckle holes, and portion of straps is for illustrative purposes only and forms no part of the claimed design.