Add an accessibility statement.

Describe the text-first interface, supported environments, known limitations, and how to report a barrier.

Author: anycodes

ACCESSIBILITY.md

@@ -0,0 +1,60 @@
+# Accessibility
+
+**English** | [中文](#中文)
+
+This repository is a Python library and an in-sandbox HTTP service. It has no graphical application. Text, JSON, and documented exit behavior are the interface.
+
+The terminal interface is `ebx`, maintained in [easy-sandbox](https://github.com/Easy-Sandbox/easy-sandbox). Its commitment, supported terminals, and how to turn color and animation off are in that repository's [ACCESSIBILITY.md](https://github.com/Easy-Sandbox/easy-sandbox/blob/main/ACCESSIBILITY.md).
+
+## Commitment
+
+- Public APIs return structured data (objects and JSON), not an arrangement that only makes sense on a screen.
+- Error messages name the failure in text. A secret value is not copied into the message.
+- HTTP routes that a template serves identify themselves with status codes and JSON bodies.
+- A report of a barrier is a product bug. We will answer it in the issue tracker.
+
+## Supported environments
+
+| Environment | What we support |
+|---|---|
+| Python | 3.10 or newer |
+| Operating systems | Linux, macOS, and Windows, for the client library |
+| In-sandbox server | Linux, the image you build from a template, listening on port 9000 by default |
+| Clients | Any HTTP client that can send and receive UTF-8 JSON, including a screen reader's browse mode when the caller renders that JSON as text |
+| Terminal use of the library | The same terminals and screen readers as the CLI, when you print SDK results as text |
+
+`GET /health` and other JSON routes stay text. File upload and download carry bytes and say so in the API; they are not a text alternative for the file's own contents.
+
+## Known limitations
+
+- Streaming responses (server-sent events and WebSockets) arrive as a sequence of frames. A screen reader will not announce them unless the program you wrote reads the frames and prints text.
+- The server does not render HTML and does not set a page language, landmarks, or focus order.
+- Examples under `examples/` are scripts. Their printed output is plain text. They are not an accessible interactive tutorial.
+- Sandbox images you build can run third-party programs. Those programs are outside this statement.
+
+## How to report a barrier
+
+Open an issue:
+
+https://github.com/Easy-Sandbox/python-sdk/issues/new/choose
+
+Include the call or HTTP request with secrets removed, the Python version, the operating system, and what you expected to read versus what you received. If the barrier is in `ebx` rather than the library, file it on [easy-sandbox](https://github.com/Easy-Sandbox/easy-sandbox/issues/new/choose).
+
+## 中文
+
+这个仓库是 Python 库和沙箱内的 HTTP 服务，没有图形界面。接口是文本、JSON，以及文档里写明的退出行为。
+
+终端程序是 `ebx`，在 [easy-sandbox](https://github.com/Easy-Sandbox/easy-sandbox) 仓库。终端、读屏软件，以及如何关闭颜色和动画，写在该仓库的 [ACCESSIBILITY.md](https://github.com/Easy-Sandbox/easy-sandbox/blob/main/ACCESSIBILITY.md)。
+
+我们承诺：公开 API 返回结构化数据；错误信息用文字说明失败，且不把密钥抄进消息；模板对外的 HTTP 路由用状态码和 JSON 表明自己；无障碍障碍视为产品缺陷，并在议题里回复。
+
+支持的环境：Python 3.10 及以上；客户端库支持 Linux、macOS、Windows；沙箱内服务运行在模板构建出的 Linux 镜像里，默认监听 9000 端口；任何能收发 UTF-8 JSON 的 HTTP 客户端都可以调用。
+
+已知限制：
+
+- 服务器发送事件和 WebSocket 是一帧一帧到达的。除非你的程序把帧打印成文字，读屏软件不会自动朗读。
+- 服务不渲染 HTML，也不提供页面语言、地标或焦点顺序。
+- `examples/` 下的示例是脚本，输出是纯文本，不是一套可交互的无障碍教程。
+- 你构建的沙箱镜像里可以运行第三方程序，那些程序不在本说明的范围内。
+
+报告障碍：打开 https://github.com/Easy-Sandbox/python-sdk/issues/new/choose 。写上调用或 HTTP 请求（去掉密钥）、Python 版本、操作系统，以及你期望读到的内容和实际收到的内容。如果问题出在 `ebx` 而不是这个库，请提到 [easy-sandbox](https://github.com/Easy-Sandbox/easy-sandbox/issues/new/choose)。