add images for animation function

Signed-off-by: Michael Leuschel <leuschel@uni-duesseldorf.de>

add images for animation function
6922100e · Michael Leuschel · 30a115cd · 6922100e · 6922100e
Commit 6922100e authored 2 years ago by Michael Leuschel
--- a/Sudoku/images/sm_empty_box.gif
+++ b/Sudoku/images/sm_empty_box.gif
--- a/Sudoku/images/sm_gray_box.gif
+++ b/Sudoku/images/sm_gray_box.gif