feat: update readme

Author: fridayL

README.md

@@ -39,8 +39,18 @@
       <img src="https://img.shields.io/badge/License-Apache_2.0-green.svg?logo=apache" alt="License">
     </a>
   </p>
+
+
+<a href="https://memos.openmem.net/">
+  <img src="https://statics.memtensor.com.cn/memos/github_api_free_banner.gif" alt="MemOS Free API Banner">
+</a>
+
 </div>
 
+
+Get Free API: [Try API](https://memos-dashboard.openmem.net/login/) 
+ 
+
 ---
 
 <img src="https://cdn.memtensor.com.cn/img/1762436050812_3tgird_compressed.png" alt="SOTA SCORE">