For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:badshah400:howdy/openSUSE_Tumbleweed/home:badshah400:howdy.repo
zypper refresh
zypper install howdy
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:badshah400:howdy/15.6/home:badshah400:howdy.repo
zypper refresh
zypper install howdy
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:badshah400:howdy/15.5/home:badshah400:howdy.repo
zypper refresh
zypper install howdy