Update README.md

README.md

@@ -42,6 +42,20 @@
   </a>
 </p>
 
+<p align="center">
+  <sup>Sponsored by</sup>
+  <br>
+  <a href="https://stytch.com/docs?utm_source=oss-sponsorship&utm_medium=paid_sponsorship&utm_campaign=casbin">
+    <picture>
+      <source media="(prefers-color-scheme: dark)" srcset="https://cdn.casbin.org/img/stytch-white.png">
+      <source media="(prefers-color-scheme: light)" srcset="https://cdn.casbin.org/img/stytch-charcoal.png">
+      <img src="https://cdn.casbin.org/img/stytch-charcoal.png" width="275">
+    </picture>
+  </a><br/>
+  <a href="https://stytch.com/docs?utm_source=oss-sponsorship&utm_medium=paid_sponsorship&utm_campaign=casbin"><b>Build auth with fraud prevention, faster.</b><br/> Try Stytch for API-first authentication, user & org management, multi-tenant SSO, MFA, device fingerprinting, and more.</a>
+  <br>
+</p>
+
 ## Online demo
 
 - Read-only site: https://door.casdoor.com (any modification operation will fail)