Add Broadcom Foundation's highlights article to impressions

Author: yasulab

_data/articles.yml

@@ -3,6 +3,11 @@
   author: 佐原慎也 (実行委員長)
   cover: /img/article-cover/note_sahara.webp
 
+- title: Highlights from 2026 Coolest Projects Japan!
+  url: https://broadcomfoundation.org/highlights/p/highlights-from-2026-coolest-projects-japan/
+  author: Broadcom Foundation
+  cover: /img/article-cover/blog_broadcom-foundation.png
+
 - title: "🌐 How Coolest Projects Started in the CoderDojo community (Guest: Bill Liao)"
   url: https://www.youtube.com/watch?v=udytE9_PLSg
   author: CoderDojo Japan