Add dataset card, link to paper

This PR ensures the dataset is linked to (and can be found at) https://huggingface.co/papers/2502.14949.
It also adds the task category and language.

README.md

@@ -18,8 +18,14 @@ configs:
   data_files:
   - split: train
     path: data/train-*
+task_categories:
+- image-to-text
+language:
+- ar
+- en
 ---
 
 **Please see paper & code for more information:**
 - https://github.com/mbzuai-oryx/KITAB-Bench
-- https://arxiv.org/abs/2502.14949
+- https://arxiv.org/abs/2502.14949
+- https://mbzuai-oryx.github.io/KITAB-Bench/