Update README.md

The file sprites_1788_16x16.npy contains a NumPy array of the shape (89400, 16, 16, 3), which might suggest that it contains 89400 sprites images along with their labels.

README.md

@@ -1,3 +1,5 @@
 ---
 license: cc-by-nc-2.0
----
+task_categories:
+- image-classification
+---