contrib: organize example scripts and add synergy

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

contrib/synergy/README

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+These scripts should be modified according to your precise setup.
+They provide a very simple way of tunneling synergy inside of a
+WireGuard tunnel, to protect your data in transit.

contrib/synergy/synergy-client.sh

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+#!/bin/bash
+set -ex
+if [[ $UID == 0 ]]; then
+	ip link del dev synergy || true
+	ip link add dev synergy type wireguard
+	ip address add 10.193.125.39/32 peer 10.193.125.38/32 dev synergy
+	wg set synergy \
+		listen-port 29184 \
+		private-key <(echo oNcsXA5Ma56q9xHmvvKuzLfwXYy7Uqy+bTmmXg/XtVs=) \
+		peer m321UMZXoJ6qw8Jli2spbAVBc2MdOzV/EHDKfZQy0g0= \
+			allowed-ips 10.193.125.38/32 \
+			endpoint 10.10.10.100:29184
+	ip link set up dev synergy
+else
+	sudo "$(readlink -f "$0")"
+	killall synergyc || true
+	synergyc 10.193.125.38:38382
+fi

contrib/synergy/synergy-server.sh

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+#!/bin/bash
+set -ex
+if [[ $UID == 0 ]]; then
+	ip link del dev synergy || true
+	ip link add dev synergy type wireguard
+	ip address add 10.193.125.38/32 peer 10.193.125.39/32 dev synergy
+	wg set synergy \
+		listen-port 29184 \
+		private-key <(echo 2InSrlZA5eQfI/MvnvPieqNTBo9cd+udc3SOO9yFpXo=) \
+		peer CBnoidQLjlbRsrqrI56WQbANWwkll41w/rVUIW9zISI= \
+			allowed-ips 10.193.125.39/32
+	ip link set up dev synergy
+else
+	sudo "$(readlink -f "$0")"
+	killall synergys || true
+	synergys -a 10.193.125.38:38382
+fi

contrib/systemd/README

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+Until WireGuard receives full integration to the various network
+management utilities, there are a number of ways of setting up
+a WireGuard tunnel at boot time. This systemd unit file is one
+such way of doing things. Probably it should be tweaked before
+using.