add missing default nuget package description
add missing default nuget package description

quartznet/quartznet,quartznet/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,quartznet/quartznet,quartznet/quartznet,sean-gilliam/quartznet,quartznet/quartznet