This change adds an md file which gives a high
level overview of the scylladb repository, the
components each path contains and a basic description
for each one of them. This is mainly intended for
onboarding engineers to help get a mental picture when
starting ramping up on Scylla concepts.
Refs #22908
Signed-off-by: Robert Bindar <robert.bindar@scylladb.com>
Closesscylladb/scylladb#23010
