feat: add README

src/open-webui/README.md

@@ -1,3 +1,20 @@
 # Open WebUI
 
+[English](./README.md) | [中文](./README.zh.md)
+
 Quick start: <https://docs.openwebui.com/getting-started/quick-start>.
+
+This service deploys Open WebUI, a web-based interface for LLMs.
+
+## Services
+
+- `openwebui`: The Open WebUI service.
+
+## Configuration
+
+- `OPEN_WEBUI_VERSION`: The version of the Open WebUI image, default is `main`.
+- `OPEN_WEBUI_PORT`: The host port for Open WebUI, default is `8080`.
+
+## Volumes
+
+- `open-webui`: A volume for storing Open WebUI data.