plasma5-desktop from KDE:Frameworks5:LTS:5.18 project

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For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Frameworks5:LTS:5.18/openSUSE_Leap_15.2/KDE:Frameworks5:LTS:5.18.repo
zypper refresh
zypper install plasma5-desktop