For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/shells/openSUSE_Tumbleweed/shells.repo
zypper refresh
zypper install nushell
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/shells/openSUSE_Factory/shells.repo
zypper refresh
zypper install nushell
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/shells/16.0/shells.repo
zypper refresh
zypper install nushell