Adding a new model to RoboMaker

Hi mustafadurmus,
You need to bundle the assets in your simulation application. For example, the easiest way to do it would be to follow the House World package in Github https://github.com/aws-robotics/aws-robomaker-small-house-world. Create a package in your simulation workspace, copy assets into the package, then setup the .launch file, CMakeLists.txt, and package.xml accordingly.