Launch-In-SITL.md

@@ -16,9 +16,11 @@ source ~/.bashrc
 ```
 **Clone** the repository into src
 **Clone** dependent repository into src
+**ONLY** do this if you don't them already
 ```shell
 git clone https://github.com/IntelRealSense/realsense-ros.git
 git clone http://tuotuogzs.ddns.net/droneoa/ydlidar-x2l-local.git
+git clone http://tuotuogzs.ddns.net/droneoa/droneoa_ros.git
 ```
 
 Build the node with catkin_make: