docs: add readme

README.md

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+<div align="center">
+<img src="https://raw.githubusercontent.com/piot/relay/main/docs/images/logo.svg" width="192" />
+</div>
+
+# Conclave Daemon
+
+## Install
+
+Extract the release zip containing the `relay` linux executable and `relay.service` [systemd unit file](https://www.freedesktop.org/software/systemd/man/systemd.unit.html).
+
+```console
+sudo chmod a+x relay
+sudo cp relay /usr/local/sbin/
+sudo cp relay.service /usr/local/lib/systemd/system/
+```
+
+* Make systemd reload all .service-files
+
+```console
+systemctl daemon-reload
+```
+
+* Check that systemd has read the .service-file:
+
+```console
+systemctl status relay --output cat
+```
+
+It should report something similar to:
+
+```console
+○ relay.service - UDP Relay
+     Loaded: loaded (/usr/local/lib/systemd/system/relay.service; disabled; preset: disabled)
+     Active: inactive (dead)
+```
+
+* Make sure it is started, if machine is rebooted in the future:
+
+```console
+systemctl enable relay
+```
+
+* Start it now:
+
+```console
+systemctl start relay
+```
+
+## Useful commands
+
+### journalctl
+
+[journalctl](https://www.freedesktop.org/software/systemd/man/journalctl.html) outputs the log entries stored in the journal.
+
+```console
+journalctl -u relay -b --output cat -f
+```