We claim the ornamental design for a projector, as shown and described.
FIG. 1 is a top perspective view of a projector of the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a first side view thereof;
FIG. 5 is a second side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line showing of the projector is included for the purpose of illustrating the environment and forms no part of the claimed design. Additionally, the uneven broken lines in the drawings define the limits of the claimed design.