add examples, document systemd-networkd and wg-quick #68
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This documents that wg-quick and that systemd-network is optional
I link to the Debian manpages because it's the first thing that came up in a web search, but I'm happy to link elsewhere if there's a better reference.
It also adds an extra example using facts, cross-ref from README. I'm not actually sure that works, but it feels like something like that is missing from the examples...