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 of the footwear shown in FIG. 1;
FIG. 3 is a right side view of the footwear shown in FIG. 1;
FIG. 4 is a front view of the footwear shown in FIG. 1; and,
FIG. 5 is a top view of the footwear shown in FIG. 1.
The broken line showing of the sole, heel, heel cap, strap, buckle, buckle holes, circular pieces and front platform of footwear is for illustrative purposes only and forms no part of the claimed design.