Add pipeline tag and library name

This PR adds the missing pipeline tag and library name, improving discoverability of the model and ensuring the "how to use" button appears on the top right.

README.md

@@ -1,12 +1,14 @@
 ---
-license: apache-2.0
-language:
-- en
-- zh
 base_model:
 - URSA-MATH/URSA-8B
 datasets:
 - URSA-MATH/DualMath-1.1M
+language:
+- en
+- zh
+license: apache-2.0
+pipeline_tag: image-text-to-text
+library_name: transformers
 ---
 
 # URSA-8B