Update Readme.md

Readme.md

@@ -45,6 +45,7 @@ Make sure there is no error in this launch. You can then close terminate the ter
 Clone the repository as to your home: `git clone https://github.com/CPS2018/Simulation_F651.git`
 1. Open a terminal and type `printenv | grep GAZEBO`
 2. Two or more paths should be displayed:
+
    `GAZEBO_MODEL_PATH=:/home/user/src/Firmware/Tools/sitl_gazebo/models:/home/user/catkin_ws/src/simulation_control/src/models`
    
    `GAZEBO_PLUGIN_PATH=:/home/user/src/Firmware/Tools/sitl_gazebo/Build` (Gazebo gets it's models in this case from two paths which are told apart by the `:` sign.)