added providers

settings.json

@@ -0,0 +1,20 @@
+{
+  "default_provider": "",
+  "providers": {
+    "openai": {
+      "base_url": "https://api.openai.com/v1",
+      "api_key_env": "OPENAI_API_KEY",
+      "model": "gpt-4.1"
+    },
+    "anthropic": {
+      "base_url": "https://api.anthropic.com/v1/",
+      "api_key_env": "ANTHROPIC_API_KEY",
+      "model": "claude-sonnet-4-5"
+    },
+    "gemini": {
+      "base_url": "https://generativelanguage.googleapis.com/v1beta/openai/",
+      "api_key_env": "GEMINI_API_KEY",
+      "model": "gemini-2.5-pro"
+    }
+  }
+}