Add icon for new Java practice exercise: Mazy Mice #162
Description
Link to the exercise: https://exercism.org/tracks/java/exercises/mazy-mice
PR to add the exercise to the problem specifications: exercism/problem-specifications#2312
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Link to the exercise: https://exercism.org/tracks/java/exercises/mazy-mice
PR to add the exercise to the problem specifications: exercism/problem-specifications#2312