Fast resource indexing for ROS 2 packages (C++ headers)

 The ament build system is the most common way to build packages for ROS 2.
 ament_index is a filesystem-based resource management system which is
 designed to allow queries on installed ROS 2 packages without crawling
 the filesystem.
 .
 This package installs the C++ development files and headers for the C++
 client library.