📝 Mention sponsors in package readme too

Author: kzu

src/WebSocketPipe/readme.md

@@ -123,4 +123,13 @@ async Task Echo(IDuplexPipe pipe)
         pipe.Input.AdvanceTo(result.Buffer.End);
     }
 }
-```
+```
+
+
+## Sponsors
+
+[![sponsored](https://raw.githubusercontent.com/devlooped/oss/main/assets/images/sponsors.svg)](https://github.com/sponsors/devlooped) [![clarius](https://raw.githubusercontent.com/clarius/branding/main/logo/byclarius.svg)](https://github.com/clarius)[![clarius](https://raw.githubusercontent.com/clarius/branding/main/logo/logo.svg)](https://github.com/clarius)
+
+*[get mentioned here too](https://github.com/sponsors/devlooped)!*
+
+