The ornamental design for a credenzashelf, substantially as shown and described.
FIG. 1 is a top plan view of a credenza shelf showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof; and,
FIG. 4 is a rear elevational view thereof.
The left side elevational view is substantially identical to the right side
elevational view of FIG. 3; and, the bottom plan view is substantially
identical to the top plan view of FIG. 1.