You should run the Client commands inside cs_packages directory.
RAGEMP\server-files\client_packages\cs_packages
Creates a new client script with example commands
dotnet new rage-clientscript -n BeastClientScript
Creates a Client Script using the NativeUI with example menus
dotnet new rage-clientscript -n BeastClientMenu -s nativeui
Creates a Client Script of type events with example events
dotnet new rage-clientscript -n BeastClientEvents -s events