Commit: README.md: Add sponsor banner

[Christian Brabandt]

README.md: Add sponsor banner

Commit: 
https://github.com/vim/vim/commit/6fd17cbf02bd4d787d6010bec1c6f1ebed725206
Author: Christian Brabandt <c...@256bit.org>
Date:   Wed Aug 27 22:28:34 2025 +0200

    README.md: Add sponsor banner
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/README.md b/README.md
index 66a1e6cb8..e4483fb1a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,15 @@
+<div align="center" markdown="1">
+   <sup>Special thanks for supporting Vim by donating to the <a 
href="https://iccf-holland.org/";>ICCF</a>:</sup>
+   <br>
+   <br>
+   <a href="https://www.warp.dev/vim";>
+      <img alt="Warp sponsorship" width="400" 
src="https://raw.githubusercontent.com/warpdotdev/brand-assets/refs/heads/main/Github/Sponsor/Warp-Github-LG-03.png";>
+   </a>
+
+### [Warp, built for coding with multiple AI agents.](https://www.warp.dev/vim)
+[Available for MacOS, Linux, & Windows](https://www.warp.dev/vim)<br>
+</div>
+<hr>
 # [![Vim The 
editor](https://github.com/vim/vim/raw/master/runtime/vimlogo.gif)](https://www.vim.org)
 
 [![Github Build 
status](https://github.com/vim/vim/workflows/GitHub%20CI/badge.svg)](https://github.com/vim/vim/actions?query=workflow%3A%22GitHub+CI%22)

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