Create velocity profiles for the 2dof movements

...dof/launch/kuka_rviz_simulation_2dof_sequential_launch.py

...f/launch/kuka_rviz_simulation_2dof_simultaneous_launch.py

..._2dof/simple_robot_2dof/forward_kinematics_node_2dof_1.py

..._2dof/simple_robot_2dof/forward_kinematics_node_2dof_2.py

...imple_robot_2dof/simple_robot_2dof/reference_node_2dof.py