C++ Development Guidelines

[vedarshshah]

As we have added C++ code to the repo, we need to have helpful guidelines on how to develop with C++ in ROS. Currently, these are provided in the controls README. However, the guidelines apply to any C++ development across any package, so they should be placed in a common location that is not tied to a specific package.

[vedarshshah]

This is not necessary for the following reasons:

• The controls README doesn't contain much information about C++ development that would be generally applicable.
• When we transitioned to ROS2, we transitioned thrusters.cpp to Python. For the foreseeable future, we don't expect to develop any C++ code outside of controls.
• If someone does start developing C++ code outside of controls, it is very likely they would use controls as an example.