add cesar as contributor

Author: klieret

docs/index.md

@@ -5,7 +5,7 @@
 
 <div class="author-box">
   <p><strong>Authors:</strong> Kilian Lieret, Carlos Jimenez, John Yang, Ofir Press.</p>
-  <p><strong>Contributions by</strong> ... <a href="#contribute">Contribute</a></p>
+  <p><strong>Contributions by</strong> Cesar Garcia <a href="#contribute">Contribute</a></p>
 </div>
 
 So you want to build your own AI agent from scratch? The good news: It's super simple, especially with more recent language models.
@@ -658,4 +658,4 @@ If you have questions or comments, please comment below. Note that [GitHub issue
         data-lang="en"
         crossorigin="anonymous"
         async>
-</script>
+</script>