README: expand description of packaging metadata (#44124)

* README: expand description of repository packaging data. --------- Signed-off-by: Steve Peters <[email protected]>
ros · Jan 11, 2025 · b793e89 · b793e89
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-This repo maintains the lists of repositories defining ROS distributions.
+This repository maintains two independent sets of packaging metadata used in ROS:
 
-It is the implementation of [REP 143](http://ros.org/reps/rep-0143.html).
+1. The lists of repositories that curate ROS packages for each ROS distributions,
+   implementing the data structure defined in [REP 143](http://ros.org/reps/rep-0143.html).
+   Any ROS package release will generate pull requests to the distribution files
+   in this repository.
 
-It also the home of the rosdep rules.
+2. The rosdep rules database, which map the package names used in package.xml files to
+   system package names.
 
 Guide to Contributing
 ---------------------