added config example yaml

config/config.example.yaml

@@ -0,0 +1,15 @@
+# OpenRAG Configuration File
+provider:
+  model_provider: "openai" # openai, anthropic, azure, etc.
+  api_key: "your-api-key" # or use OPENAI_API_KEY env var
+
+knowledge:
+  embedding_model: "text-embedding-3-small"
+  chunk_size: 1000
+  chunk_overlap: 200
+  ocr: true
+  picture_descriptions: false
+
+agent:
+  llm_model: "gpt-4o-mini"
+  system_prompt: "You are a helpful AI assistant..."