Markers: Basic shapes

we initialize node name "basic_shapes" and make publisher with topic name "visualization_marker"

we set our frame id == "/my_frame" 

set namespace(ns) to "basic_shapes" and id to 0 == if a marker message is received with the same ns and id, the new marker will replace the old one.

first starting shape is CUBE

inside switch we keep change the shape variable to something else

roslaunch using_makers marker_tutorial.launch

Shape keeps changing every 1 second