The ornamental design for a projector, as shown and described.
FIG. 1 is a perspective view of a projector showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged view of the projector shown within the area designated as 9 in FIG. 2.
The broken lines in the drawings are for the purpose of illustrating portions of the projector that form no part of the claimed design. The dot-dashed broken line in FIG. 9 shows the boundary of the enlarged view and forms no part of the claimed design.