Merge: projects: update some short descriptions

Improve (or create) the short description of some random projects.

Note that using the fist line of the `README.md` is maybe not the best approach since the first line of a README is often a short title (approx 30 chars) whereas, to be informative the short description (synopsis) is often a long title (approx 70 chars).

Pull-Request: #1670
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --cc lib/core/README.md
Simple merge