This part of the doc will help you to quick start your project and will you a basic idea about how Atmos admin is structured.
After you unzip the package received from themeforest you will have the following in the extracted folder.
demo folder consist of demo pages available on live site. which can be used for reference for your project.we do not recommend to start your project from demo files.
getting started folder, select a theme default or light to proceed with developing
check build section of docs for running via gulp