Add QD draft for Boost exernal dependency

[Blast545]

This is a quality declaration for Boost libraries, considered an external dependency of class_loader package. REP-2004 (see ros-infrastructure/rep#218) establishes that external dependencies have to be quality level 1, for the ROS package using them to be considered of that same level.

External dependencies do not have a defined set of parameters to be evaluated to be considered to be Quality level 1. However, this PR aims to start discussing the best way to make this statement in a standard way or deciding if the external dependencies require a more qualitative approach.

Signed-off-by: Jorge J. Perez jjperez@ekumenlabs.com

[Blast545]

Closing it here, to open it as part of class_loader.

[dirk-thomas]

considered an external dependency of class_loader package

I assume we are referring to ROS 2 here and in that case I think the statement is incorrect. class_loader doesn't depend on boost in ROS 2 afaik.

[Blast545]

@dirk-thomas Yes, you are right. I realized that when I was moving the description to the class_loader repo