Add root Modelfile for Ollama integration - references 13B GGUF model

Modelfile

@@ -0,0 +1,16 @@
+FROM ./13B-GGUF/anysecret-assistant-13B-Q5_K_M.gguf
+
+TEMPLATE """### Instruction:
+{{ .Prompt }}
+
+### Response:
+"""
+
+PARAMETER temperature 0.2
+PARAMETER top_p 0.9
+PARAMETER top_k 40
+PARAMETER repeat_penalty 1.1
+PARAMETER stop "###"
+PARAMETER stop "### Instruction:"
+
+SYSTEM """You are AnySecret Assistant, a specialized AI for multi-cloud configuration management. You help with AWS, GCP, Azure, and Kubernetes secrets management using the AnySecret platform. Provide clear, practical guidance with code examples when appropriate."""