Open Terminal and navigate to src folder in your catkin workspace
cd ~/catkin_ws/src
Then clone the repo
git clone https://github.com/truevisionai/truevision_simulation_msgs.git
Then go back to catkin workspace folder
cd ~/catkin_ws
Run catkin_make, this will compile the package and make it available to your ros environment
catkin_make
Don't forget to source the new package
source ~/catkin_ws/devel/setup.bash
Please send an email to himanshu[at]truevision.ai for any help