Set GdUnit3 into maintenance mode

Author: MikeSchulze

README.md

@@ -25,8 +25,12 @@
 GdUnit3 is a framework for testing Gd-Scrips/C# and Scenes within the Godot editor. GdUnit3 is very useful for test-driven development and will help you get your code bug-free.
 
 
-# GdUnit4 alpha is released!
-https://github.com/MikeSchulze/gdUnit4 
+> __Note__
+>
+>  ${\Large\color{red}GdUnit3\ is\ Now\ in\ Maintenance\ Mode!}$
+>
+>  Meaning that no new features will be added and only bug fixes will be made.<br> 
+>  The development of GdUnit continues with <a href="https://github.com/MikeSchulze/gdUnit4">GdUnit4</a>, which is designed for use with Godot4.
 
 
 ## Features