Update metadata: Add `library_name`

This pull request adds `library_name: datasets` to the metadata of the dataset card, as specified in the dataset card guidelines for relevant metadata.

README.md

@@ -12,6 +12,7 @@ tags:
 - multi-modal
 - mathematical-reasoning
 - geometry
+library_name: datasets
 ---
 
 # InfiMM-WebMath-40B Dataset