Update README, features description added

README.md

@@ -4,6 +4,14 @@ license: mit
 task_categories:
 - object-detection
 - image-segmentation
+dataset_info:
+  features:
+  - name: file_name
+    dtype: image
+  - name: height
+    dtype: int32
+  - name: width
+    dtype: int32
 configs:
 - config_name: arcgis
   sep: ;