Add Sponsors section to README

Author: Sponsors Bot

README.md

@@ -80,3 +80,11 @@ services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
         clientId: "<google-client-id>",
         hostedDomain: "<optional-g-suite-domain>"));
 ````
+
+## Sponsors
+
+[Entity Framework Extensions](https://entityframework-extensions.net/?utm_source=khellang&utm_medium=Middleware) and [Dapper Plus](https://dapper-plus.net/?utm_source=khellang&utm_medium=Middleware) are major sponsors and proud to contribute to the development of Middleware.
+
+[![Entity Framework Extensions](https://raw.githubusercontent.com/khellang/khellang/refs/heads/master/.github/entity-framework-extensions-sponsor.png)](https://entityframework-extensions.net/bulk-insert?utm_source=khellang&utm_medium=Middleware)
+
+[![Dapper Plus](https://raw.githubusercontent.com/khellang/khellang/refs/heads/master/.github/dapper-plus-sponsor.png)](https://dapper-plus.net/bulk-insert?utm_source=khellang&utm_medium=Middleware)