Adding sponsorship to README.md

Author: spf13

README.md

@@ -11,6 +11,20 @@ name a few. [This list](site/content/projects_using_cobra.md) contains a more ex
 [![Go Reference](https://pkg.go.dev/badge/github.com/spf13/cobra.svg)](https://pkg.go.dev/github.com/spf13/cobra)
 [![Go Report Card](https://goreportcard.com/badge/github.com/spf13/cobra)](https://goreportcard.com/report/github.com/spf13/cobra)
 [![Slack](https://img.shields.io/badge/Slack-cobra-brightgreen)](https://gophers.slack.com/archives/CD3LP1199)
+<hr>
+<div align="center" markdown="1">
+   <sup>Supported by:</sup>
+   <br>
+   <br>
+   <a href="https://www.warp.dev/cobra">
+      <img alt="Warp sponsorship" width="400" src="https://github.com/user-attachments/assets/ab8dd143-b0fd-4904-bdc5-dd7ecac94eae">
+   </a>
+
+### [Warp, the AI terminal for devs](https://www.warp.dev/cobra)
+[Try Cobra in Warp today](https://www.warp.dev/cobra)<br>
+
+</div>
+<hr>
 
 # Overview