gnunet from filesharing project

对于 openSUSE Tumbleweed，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/filesharing/openSUSE_Tumbleweed/filesharing.repo
zypper refresh
zypper install gnunet

对于 16.0，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/filesharing/16.0/filesharing.repo
zypper refresh
zypper install gnunet

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/filesharing/15.6/filesharing.repo
zypper refresh
zypper install gnunet