Create class_names.txt

DataAnnotation/labelme/examples/instance_segmentation/data_dataset_voc/class_names.txt

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+_background_
+aeroplane
+bicycle
+bird
+boat
+bottle
+bus
+car
+cat
+chair
+cow
+diningtable
+dog
+horse
+motorbike
+person
+potted plant
+sheep
+sofa
+train
+tv/monitor