update readme

README_JA.md

@@ -328,6 +328,8 @@ APIの使い方も簡単だ。以下の例をご覧ください：
 import openai
 openai.api_base = "http://localhost:8000/v1"
 openai.api_key = "none"
+
+# create a request activating streaming response
 for chunk in openai.ChatCompletion.create(
     model="Qwen-7B",
     messages=[
@@ -337,6 +339,16 @@ for chunk in openai.ChatCompletion.create(
 ):
     if hasattr(chunk.choices[0].delta, "content"):
         print(chunk.choices[0].delta.content, end="", flush=True)
+
+# create a request not activating streaming response
+response = openai.ChatCompletion.create(
+    model="Qwen-7B",
+    messages=[
+        {"role": "user", "content": "你好"}
+    ],
+    stream=False
+)
+print(response.choices[0].message.content)
 ```
 
 ## ツールの使用