The ornamental design for footwear, as shown and described.
FIG. 1 is a perspective view of the footwear;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The darker shaded portions of the footwear in the drawings represent a color that is different from the lighter shaded portions. The broken line showing of the texture pattern on the bottom of the footwear is environmental and forms no part of the claimed design.