Initial commit: OpenRouter Python SDK

Auto-generated Python SDK for OpenRouter API, providing comprehensive client library with:
- Chat completions and streaming support
- Embeddings API
- Model and provider information
- API key management
- Analytics and usage tracking
- OAuth authentication flows
- Full type hints and error handling

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "python.testing.pytestArgs": ["tests", "-vv"],
+  "python.testing.unittestEnabled": false,
+  "python.testing.pytestEnabled": true,
+  "pylint.args": ["--rcfile=pylintrc"]
+}