add assets and update README

README.md

@@ -95,7 +95,7 @@ Or contact @mannaandpoem via 📧email: mannaandpoem@gmail.com
 ## Community Group
 Join our networking group and share your experience with other developers!
 <div align="center">
-    <img src="assets/community_group.jpeg" alt="OpenManus Community Group" width="300"/>
+    <img src="assets/community_group.jpg" alt="OpenManus Community Group" width="300"/>
 </div>
 
 ## Acknowledgement

README_zh.md

@@ -96,7 +96,7 @@ python run_flow.py
 加入我们的交流群，与其他开发者分享经验！
 
 <div align="center">
-    <img src="assets/community_group.jpeg" alt="OpenManus 交流群" width="300"/>
+    <img src="assets/community_group.jpg" alt="OpenManus 交流群" width="300"/>
 </div>
 
 ## 致谢