Add link to Polyglot-Ko-12.8B MOT badge to README.md file

The Polyglot-Ko-12.8B model qualifies as "Class II - Open Tooling Model" and "Class III - Open 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

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 # Polyglot-Ko-12.8B
 
+[![mof-class2-qualified](https://mot.isitopen.ai/modules/mof/assets/badge_class2_qualified.png)](https://mot.isitopen.ai/model/Polyglot-Ko)
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+[![mof-class3-qualified](https://mot.isitopen.ai/modules/mof/assets/badge_class3_qualified.png)](https://mot.isitopen.ai/model/Polyglot-Ko)
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 ## Model Description
 Polyglot-Ko is a series of large-scale Korean autoregressive language models made by the EleutherAI polyglot team.