This is a GitHub template. You can make your own copy by clicking the green "Use this template" button.
It is recommended that you keep the repo/package name the same, but if you do change it, ensure you do a "Find all" using your IDE (or the built-in GitHub IDE by hitting the . key) and rename all instances of ev3ros to whatever your project's name is.
Note that each directory currently has at least one file in it to ensure that git tracks the files (and, consequently, that a fresh clone has direcctories present for CMake to find). These example files can be removed if required (and the directories can be removed if CMakeLists.txt is adjusted accordingly).