Add MOT badge

This model qualifies as "Class I - Open Science Model" under the Model Openness Framework (MOF) from LF AI & Data.
This change adds the corresponding badge with a link to the related record in the Model Openness Tool (MOT).

README.md

@@ -6,6 +6,7 @@ datasets:
 - allenai/dolma
 ---
 
+[![mof-class1-qualified](https://mot.isitopen.ai/modules/mof/assets/badge_class1_qualified.png)](https://mot.isitopen.ai/model/1171)
 
 <img src="https://allenai.org/olmo/olmo-7b-animation.gif" alt="OLMo Logo" width="800" style="margin-left:'auto' margin-right:'auto' display:'block'"/>