The ornamental design for a folder with writing implement holder, as shown and described.
FIG. 1 is an isometric front view of the present invention design in a folder position.
FIG. 2 is both the front and rear view of the present invention design in an unfolded position.
FIG. 3 is the elevation view of the present invention design in the folded position.
FIG. 4 is the front view of the present invention design in the folder position showing the position of a writing implement within the folder.
FIG. 5 is the rear view of the present invention design in the folder position showing the position of a writing implement within the folder.
FIG. 6 is the top view of the present invention design in the folder position showing the position of a writing implement within the folder; and,
FIG. 7 is the bottom view of the present invention design in the folder position showing the position of a writing implement within the folder.
The broken line depiction of elements of folder with writing implement holder is for the purpose of illustrating portions that form no part of the claimed design.