Update ref.txt

ref.txt

@@ -1 +1,2 @@
-https://github.com/plaban1981/Agents/blob/main/SQL_Agents_with_CrewAI_and_Llama_3.ipynb
+1. https://github.com/plaban1981/Agents/blob/main/SQL_Agents_with_CrewAI_and_Llama_3.ipynb
+2. https://huggingface.co/spaces/fahmiaziz/rag-sql-agent