Add documentation of CRDT ideas
Add documentation of CRDT ideas

My latest thinking on how to make async plugins and undo work well.
This is relevant to pull request #43 (plugin architecture RFC).

fuchsia-mirror/third_party-xi-editor,modelorganism/xi-editor,fuchsia-mirror/third_party-xi-editor,google/xi-editor,google/xi-editor,modelorganism/xi-editor,google/xi-editor,fuchsia-mirror/third_party-xi-editor,modelorganism/xi-editor,fuchsia-mirror/third_party-xi-editor,google/xi-editor