Turtlebot3.md

@@ -159,6 +159,8 @@ roslaunch turtlebot3_manipulation_bringup turtlebot3_manipulation_bringup.launch
 
 # Gazebo with multi-turtlebot3s
 
+Gazebo is a robotics simulation framework that allows several different robots to evolve in a predefined spatial environment. By example, it is possible to deploy several turtlebot3 burgers in a simulated environment of Fayol building.
+
 ## configure gazebo launch file
 
 ## visualize data of each robot in rviz