add launch file

src/object_detection/launch/object_detection_launch.py

@@ -0,0 +1,15 @@
+from launch import LaunchDescription
+from launch_ros.actions import Node
+
+def generate_launch_description():
+    return LaunchDescription([
+        Node(
+            package="object_detection",
+            executable="multiflex_reader",
+            name="multiflex_reader",
+            parameters=[
+                {"serial_port": "/dev/ttyACM0"}
+            ]
+        )
+
+    ])