Add `text-to-3d` task category

This PR adds the `text-to-3d` task category to the dataset card metadata, improving its discoverability on the Hugging Face Hub for tasks related to generating 3D artifacts from text.

README.md

@@ -1,12 +1,14 @@
 ---
-license: apache-2.0
 language:
 - en
-tags:
-- medical
-pretty_name: CT-RATE_Synthetic
+license: apache-2.0
 size_categories:
 - 1K<n<10K
+pretty_name: CT-RATE_Synthetic
+tags:
+- medical
+task_categories:
+- text-to-3d
 ---
 
 # Dataset Card for Synthetic Text-to-CT Scans - VLM3D Challenge
@@ -91,4 +93,5 @@ If you use this dataset, please cite the following work:
   author={Molino, Daniele and Caruso, Camillo Maria and Ruffini, Filippo and Soda, Paolo and Guarrasi, Valerio},
   journal={arXiv preprint arXiv:2506.00633},
   year={2025}
-}
+}
+```