Add README.md

Set the working directory to /opt/lolopener and use the -c cli flag to
set the config file path

README.md

@@ -0,0 +1,42 @@
+# matrix-lolopener
+
+A simple matrix bot which posts to a list of matrix rooms everytime the front door is opened or closed.
+The door state is retrieved by subscribing to an MQTT topic, and a matrix event is sent every time that state changes.
+
+## building
+
+```sh
+cargo build --release
+```
+
+## installing
+
+```sh
+useradd -r -M -s /usr/sbin/nologin matrix-lolopener
+install -o matrix-lolopener -g nogroup target/release/matrix-lolopener /opt/matrix-lolopener/bin/
+install -o matrix-lolopener -g nogroup -m 600 -T config.yml.example /opt/matrix-lolopener/etc/config.yml
+cp matrix-lolopener.service /etc/systemd/system/
+$EDITOR /opt/matrix-lolopener/etc/config.yml
+systemctl daemon-reload && systemctl enable --now matrix-lolopener.service
+```
+
+## usage
+
+```
+Matrix bot posting when the front door is opened or closed
+
+Usage: matrix-lolopener [OPTIONS]
+
+Options:
+  -c, --config <CONFIG>  Configuration file path [default: config.yml]
+  -h, --help             Print help
+  -V, --version          Print version
+```
+
+## contributing
+
+Send PRs to https://git.labolyon.fr/mirsal/matrix-lolopener
+
+## license
+
+GPL v3 or later

matrix-lolopener.service

@@ -4,8 +4,8 @@ Description=LOL-Opener Matrix Bot
 [Service]
 Type=simple
 User=matrix-lolopener
-WorkingDirectory=/opt/matrix-lolopener/etc
-ExecStart=/opt/matrix-lolopener/bin/matrix-lolopener
+WorkingDirectory=/opt/matrix-lolopener
+ExecStart=/opt/matrix-lolopener/bin/matrix-lolopener -c etc/config.yml
 Restart=on-failure
 RestartSec=5