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 a sole, heel, heel cap, buckle, buckle holes, portion of straps, heel cup and footbed is for illustrative purposes only and forms no part of the claimed design.