doc: add openomy (ant-design#6874)

Author: kiner-tang

README.md

@@ -43,8 +43,15 @@ If you have some questions about how to use ant-mobile, you can start a [discuss
 
 ---
 
+
+## 🤝 Contributing 
+
 Thanks to all the contributors of antd-mobile:
 
+<a href="https://openomy.app/github/ant-design/ant-design-mobile" target="_blank" style="display: block; width: 100%;" align="center">
+  <img src="https://www.openomy.app/svg?repo=ant-design/ant-design-mobile&chart=bubble&latestMonth=3" target="_blank" alt="Contribution Leaderboard" style="display: block; width: 100%;" />
+</a>
+
 <a href="https://github.com/ant-design/ant-design-mobile/graphs/contributors">
   <img src="https://opencollective.com/ant-design-mobile/contributors.svg?width=960&button=false" alt="contributors" />
 </a>