The ornamental design for a projector, as shown and described.
FIG. 1 is a front view of a projector showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof; and,
FIG. 8 is another perspective view thereof.
The dashed or broken lines shown in the drawings depict portions of the projector in which the design is embodied that form no part of the claimed design.