Solved my issue by copying nessary CMakeLists.txt from developer's another project.
To solve this:
Copy CMakeLists.txt in the project's root folder.
Copy CMakeListsSRC.txt in /src folder (where the Main.cpp, yml file is). Rename the txt file to CMakeLists.txt
and you're good to go.
CMakeLists.txtCMakeListsSRC.txt
Can't run cmake because there's no txt file. Please add it to the package ASAP please.