Adding transformers tag for better tracking of library

cc:

@patrickvonplaten
🤗

README.md

@@ -33,6 +33,8 @@ extra_gated_description: >-
   If you want to learn more about how we process your personal data, please read
   our <a href="https://mistral.ai/terms/">Privacy Policy</a>.
 pipeline_tag: text2text-generation
+tags:
+- transformers
 ---
 
 # Devstral-Small-2505