feat: update README

README.md

 # yunheBot
+
+## 问答接口
+
+url:    /api/v1/completion
+methon: POST
+request:
+    ```json
+    {
+        "prompt": "your question here", // 提问
+        "score": 0.8,                   // 置信度，表示计算得分超过0.8则入选
+        "limit": 1,                     // 备选答案数量，目前返回得分最高的答案
+        "stream": false                 // 是否流式返回，预留
+    }
+    ```
+Response:
+    ```json
+    {
+        "code": 200,                         // 状态码，200为请求成功，其余为失败
+        "data": {
+            "answer": "my answer here", 
+            "question": "your question here",
+            "type": "demo"                  // 跳转类型
+        },
+        "message": "OK"                     // response消息
+    }
+    ```

src/yunhebot/api/v1/completion.py

@@ -19,6 +19,7 @@ POST_SCHEMA = {
         "prompt": {"type": "string"},
         "limit": {"type": "integer"},
         "score": {"type": "integer"},
+        "stream": {"type": "boolean"},
     },
     "required": ["prompt"],
 }