add train.py

form dataset for current date
add exception catching

constants.py

@@ -0,0 +1,13 @@
+import os
+from datetime import datetime
+
+from dto.annotationClass import AnnotationClass
+
+current_dataset_dir = os.path.join('datasets', 'zombobase-current')
+current_images_dir = os.path.join(current_dataset_dir, 'images')
+current_labels_dir = os.path.join(current_dataset_dir, 'labels')
+annotation_classes = AnnotationClass.read_json()
+
+
+prefix = 'zombobase-'
+today_dataset = os.path.join('datasets', f'{prefix}{datetime.now():%Y-%m-%d}')