Update README.md

Author: padhupradheep

README.md

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 This simulation package provides a quick and easy way to try out the autonomous mobile robots from Neobotix in ROS-2. It comes with the most commonly used configuration but is open for any kind of modification.
 
-Please find our documentations in https://neobotix-docs.de/ros/ros2/simulation_classic.html
+Please find our documentations in https://neobotix-docs.de/ros/ros2/simulation_classic.html
+
+Since the classic gazebo has reached End of Life, There will be no further updates to this packages. 
+
+All the robots in this packages have been migrated to modern Gazebo with some more additional features. More information about the installation and usage of the new modern Gazebo simulation can be [found in our documentation.](https://neobotix-docs.de/ros/ros2/simulation_modern.html)