Update README.md

Add leaderboard screenshot

README.md

@@ -24,6 +24,8 @@ A-LLM is a Korean large language model built on Meta's Llama-3-8B architecture
 The model was trained using the DoRA (Weight-Decomposed Low-Rank Adaptation) methodology on a comprehensive Korean dataset
 , achieving state-of-the-art performance among open-source Korean language models.
 
+![leaderboard_screenshot](./horangi.png)
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 ## Performance Benchmarks
 ### Horangi Korean LLM Leaderboard