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Start a new document with an overview of isolation in Scylla, i.e., scheduling groups, I/O priority classes, controllers, etc. As all documents in docs/, this is a document for developers (not users!) who need to understand how isolation between different pieces of Scylla (e.g., queries, compaction, repair, etc.) works, which scheduling groups and I/O classes we have and why, etc. The document is still very partial and includes a lot of TODOs on places where the explanation needs to be expanded. In particular it needs an accurate explanation (and not just a name) of what kind of work is done under each of the groups and classes, and an explanation of how we set up RPC to use which scheduling groups for the code it executes. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20190103183232.21348-1-nyh@scylladb.com>