The ornamental design for a projector, as shown and described.
FIG. 1 is a front and top perspective view of a projector with a lens cover being illustrated in an open position;
FIG. 2 is a front view thereof with the lens cover being illustrated in an open position;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof with the lens cover being illustrated in a closed position;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a front perspective view of the projector with the lens cover being illustrated in a closed position and the handle shown in a downward position.