Add example usage with Valheim dedicated server

README.md

@@ -1,3 +1,3 @@
 # valproxy
 
-UDP proxy for Valheim dedicated server Systemd socket activation
+UDP proxy for Valheim dedicated server Systemd socket activation.

systemd/valheim-proxy.service

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+[Unit]
+# BindsTo ensures that the Valheim server will start and be shut down along with the proxy.
+BindsTo=valheim.service
+After=valheim.service
+Requires=valheim-proxy.socket
+After=valheim-proxy.socket
+
+[Service]
+Type=simple
+WorkingDirectory=/home/valheim/valproxy
+
+# This is using asdf to manage the version of Node.js
+ExecStart=/home/valheim/.asdf/shims/node index.js 127.0.0.1 2456

systemd/valheim-proxy.socket

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+[Socket]
+ListenDatagram=41831
+
+[Install]
+WantedBy=sockets.target

systemd/valheim.service

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+[Unit]
+Description=Valheim server
+StopWhenUnneeded=yes
+
+[Service]
+Type=simple
+WorkingDirectory=/home/valheim/valheim
+Environment=LD_LIBRARY_PATH=./linux64
+Environment=SteamAppID=892970
+ExecStart=/home/valheim/valheim/valheim_server.x86_64 -name "server_name" -port 2456 -nographics -batchmode -world "world_name" -password "password" -public 0
+
+# Important! Always kill with SIGINT so that the server has a chance to save the world.
+KillSignal=SIGINT
+WatchdogSignal=SIGINT