Add logging to MQTT client and main application; create systemd service file

main.py

@@ -1,9 +1,12 @@
+import logging
 import tomllib
 
 from hasspy.mqtt import HassClient
 
 
 def main() -> None:
+    logging.basicConfig(level=logging.INFO)
+
     with open("config.toml", "rb") as file:
         config = tomllib.load(file)