add logging setting

src/teams_ctrl.py

@@ -304,12 +304,15 @@ if __name__ == "__main__":
         "-t", "--token", required=True, help="MS Teams client API token file"
     )
     parser.add_argument("-p", "--port", required=True, help="Serial port")
+    parser.add_argument(
+        "--log",
+        choices=["CRITICAL", "ERROR", "WARNING", "INFO", "DEBUG", "NOTSET"],
+        default="WARNING",
+        help="Logging level",
+    )
     args = parser.parse_args()
 
     with open(args.token) as tf:
         token = tf.read().strip()
 
     asyncio.run(amain())
-
-    # loop = asyncio.new_event_loop()
-    # asyncio.set_event_loop(loop)