chore: add contributor badge (#3281)

Author: Wendong-Fan

README.ja.md

@@ -548,6 +548,14 @@ CAMELのマルチエージェントフレームワークがインフラ自動化
 >
 > また、CAMELをソーシャルメディア、イベント、カンファレンスで共有することで、CAMELの成長を支援していただくことも歓迎します。あなたのサポートが大きな違いを生みます！
 
+## コントリビューター
+
+<a href="https://github.com/camel-ai/camel/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=camel-ai/camel" />
+</a>
+
+[contrib.rocks](https://contrib.rocks)で作成。
+
 <br>
 
 ## コミュニティ & コンタクト

README.md

@@ -549,6 +549,14 @@ We are actively involved in community events including:
 >
 > We also welcome you to help CAMEL grow by sharing it on social media, at events, or during conferences. Your support makes a big difference!
 
+## Contributors
+
+<a href="https://github.com/camel-ai/camel/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=camel-ai/camel" />
+</a>
+
+Made with [contrib.rocks](https://contrib.rocks).
+
 <br>
 
 ## Community & Contact

README.zh.md

@@ -472,6 +472,14 @@ pip install camel-ai
 >
 > 我们也欢迎您通过社交媒体、活动或会议分享 CAMEL，帮助其成长。您的支持将产生巨大的影响！
 
+## 贡献者
+
+<a href="https://github.com/camel-ai/camel/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=camel-ai/camel" />
+</a>
+
+使用 [contrib.rocks](https://contrib.rocks) 制作。
+
 <br>
 
 ## 社区与联系方式

camel/toolkits/file_toolkit.py

@@ -906,15 +906,16 @@ def _write_csv_file(
         self,
         file_path: Path,
         content: Union[str, List[List]],
-        encoding: str = "utf-8",
+        encoding: str = "utf-8-sig",
     ) -> None:
         r"""Write CSV content to a file.
 
         Args:
             file_path (Path): The target file path.
             content (Union[str, List[List]]): The CSV content as a string or
                 list of lists.
-            encoding (str): Character encoding to use. (default: :obj:`utf-8`)
+            encoding (str): Character encoding to use.
+                (default: :obj:`utf-8-sig`)
         """
         import csv