added launch file for the python script

launch/rtsp.launch.py

@@ -0,0 +1,15 @@
+from launch import LaunchDescription
+from launch.actions import ExecuteProcess
+import os
+
+def generate_launch_description():
+    home_dir = os.path.expanduser("~")
+    script_path = os.path.join(home_dir, 'ros2_ws/src/image2rtsp/python/rtsp.py')
+
+    return LaunchDescription(
+        [
+            ExecuteProcess(
+                cmd=['python3', script_path],
+            ),
+        ]
+    )