Update README.md

README.md

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----
-license: cc-by-nc-sa-4.0
----
+---
+annotations_creators:
+- manual
+language:
+- en
+license: mit
+multilinguality:
+- monolingual
+size_categories:
+- 1K<n<10K
+source_datasets:
+- roboflow
+task_categories:
+- instance-segmentation
+pretty_name: Custom YOLO Dataset
+---
+
+# Custom YOLO Dataset
+
+This dataset is formatted for YOLO-based instance segmentation. It includes images and annotations for training, validation, and testing.
+
+## Dataset structure
+
+- `train/images`, `valid/images`, `test/images`: JPEG image files
+- `train/labels`, `valid/labels`, `test/labels`: YOLO-format `.txt` annotations
+- `data.yaml`: defines class names and split locations