v0.1

Initial public release. This version is a proof of concept. It demonstrates that one can create a C++ 3D Slicer module than can also be linked with the ROS2 libraries (rclcpp). This version shows that it is possible to retrieve a robot description using ROS2 parameters, load and parse said description (URDF) and then rely on ROS2 Tf2 to update the position of each link. It also contains some code to synchronize transformations between the Slicer MRML scene and ROS2 Tf2.