Update README.md

README.md

@@ -37,7 +37,10 @@ Before starting, please ensure you have installed the following
     * scikit-image
 </br>
     >Command :  
-    `pip install numpy colcon-common-extensions opencv-python pyrealsense2 cvbridge3 scikit-image`
+    >`pip install numpy colcon-common-extensions opencv-python pyrealsense2 cvbridge3 scikit-image`
+
+- $`\textcolor{red}{\text{[OPTIONAL]}}`$ Gazebo (for the simulation)
+-  $`\textcolor{red}{\text{[OPTIONAL]}}`$ Teleop twist keyboard (to control manually the robot)
 
 ### Install the package
 1. Open the command prompt in the ROS2 workspace directory