packaging: Add man page
packaging: Add man page

giuseppe/rpm-ostree,tmp-user/rpm-ostree,giuseppe/rpm-ostree,cgwalters/rpm-ostree-cgwalters,cgwalters/rpm-ostree-cgwalters,tmp-user/rpm-ostree,mdshuai/rpm-ostree,tmp-user/rpm-ostree,mdshuai/rpm-ostree,cgwalters/rpm-ostree-cgwalters,tmp-user/rpm-ostree,mdshuai/rpm-ostree,mdshuai/rpm-ostree,giuseppe/rpm-ostree,giuseppe/rpm-ostree