First commit of a simple package that can be used for demonstration.

launch/j7s_publisher_launch.py

@@ -0,0 +1,10 @@
+import launch
+import launch_ros.actions
+
+def generate_launch_description():
+    return launch.LaunchDescription([
+        launch_ros.actions.Node(
+            package='j7s-simple',
+            executable='j7s-publisher',
+            name='j7s_publisher')
+  ])