sync support

README.md

@@ -19,6 +19,7 @@ The server hosts swagger docs at `/docs`, which can be used to interact with the
 - **Full Power Of ComfyUI**: The server supports the full ComfyUI /prompt API, and can be used to execute any ComfyUI workflow.
 - **Stateless API**: The server is stateless, and can be scaled horizontally to handle more requests.
 - **Swagger Docs**: The server hosts swagger docs at `/docs`, which can be used to interact with the API.
+- **"Synchronous" Support**: The server will return base64-encoded images directly in the response, if no webhook is provided.
 - **Webhook Support**: The server can send completed images to a webhook, which can be used to store images, or to send them to a user.
 - **Warmup Workflow**: The server can be configured to run a warmup workflow on startup, which can be used to load models, and to ensure the server is ready to accept requests.
 - **Probes**: The server has two probes, `/health` and `/ready`, which can be used to check the server's health and readiness to receive traffic.