Add a new docs/dev document for the strongly consistent tables feature.
For now, it only contains information about the Raft metadata persistence,
but it should be updated as more of the strong-consistency components are
added.
This folder contains developer-oriented documentation
concerning the ScyllaDB codebase.
We also have a wiki, which contains
additional developer-oriented documentation. There is currently no clear
definition of what goes where, so when looking for something be sure to check
both.