Launch-In-SITL.md

@@ -12,7 +12,12 @@ cd ~
 echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
 source ~/.bashrc
 ```
-**Clone** the reprository into src
+**Clone** the repository into src
+**Clone** dependent repository into src
+```shell
+git clone https://github.com/IntelRealSense/realsense-ros.git
+git clone http://tuotuogzs.ddns.net/droneoa/ydlidar-x2l-local.git
+```
 
 Build the node with catkin_make:
 ```shell