The ornamental design for a shoedecoration, as shown and described.
1. Shoe decoration
1.1 is a perspective view of a shoe decoration showing the new design;
1.2 is a front view thereof;
1.3 is a rear view thereof;
1.4 is a side view thereof;
1.5 is an opposite side view thereof;
1.6 is a top view thereof; and
1.7 is a bottom view thereof.
Those portions of the shoe of the present design which are shown in blurred light grey are intended not to form part of the design for which protection is sought; in other words, protection is sought for the middle portion of the shoe including the strap (which is shown in black but may be of any colour) and the buckle.