contrib: systemd-resolved config (#1334)

contrib/systemd-resolved/README.md

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+To be put at `/usr/lib/systemd/resolved.conf.d/lokinet.conf` for distro use and `/etc/systemd/resolved.conf.d/lokinet.conf` for local admin use.
+
+To make use of it:
+```
+sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
+sudo systemctl enable --now systemd-resolved
+```

contrib/systemd-resolved/lokinet.conf

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+[Resolve]
+DNS=127.3.2.1
+Domains=~loki ~snode