xfce4-stopwatch-plugin from home:manfred-h:X11:xfce project

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For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred-h:X11:xfce/openSUSE_Leap_15.1/home:manfred-h:X11:xfce.repo
zypper refresh
zypper install xfce4-stopwatch-plugin