steam from openSUSE:Leap:15.1:NonFree:Update project

Select Your Operating System

For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.1:NonFree:Update/standard/openSUSE:Leap:15.1:NonFree:Update.repo
zypper refresh
zypper install steam