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
-    }
-    ```
+    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
+        }
+        ```