The ornamental design for a projector, as shown and described.
FIG. 1 is a front, top, right perspective view of a projector showing our new design;
FIG. 2 is a rear, top, left perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof, a left side elevational view thereof being a mirror image; and,
FIG. 6 is a top plan view thereof.
The broken lines illustrating the unclaimed portions of the projector form no part of the claimed design. Dot-dash broken lines defining the boundaries of the claimed design form no part of the claimed design.