Added info about CKEditor 4 EOL.

README.md

@@ -1,6 +1,14 @@
 CKEditor 4 - Releases
 =====================
 
+## ⚠️ CKEditor 4: End of Life and Extended Support Model until Dec 2026
+
+CKEditor 4 was launched in 2012 and reached its End of Life (EOL) on June 30, 2023.
+
+A special edition, **[CKEditor 4 LTS](https://ckeditor.com/ckeditor-4-support/)** ("Long Term Support"), is available under commercial terms (["Extended Support Model"](https://ckeditor.com/ckeditor-4-support/)) for anyone looking to **extend the coverage of security updates and critical bug fixes**.
+
+With CKEditor 4 LTS, security updates and critical bug fixes are guaranteed until December 2026.
+
 ## Releases Code
 
 This repository contains the official release versions of [CKEditor 4](https://ckeditor.com/ckeditor-4/).