This commit adds a markdown document which explains how the
thread-local VM infrastructure works, in case it is useful in the
future.
Change-Id: Id10e32a9e3c5fa38a15d4bec9800f7234c59234a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7193
Tested-by: BuildkiteCI
Autosubmit: Adam Joseph <adam@westernsemico.com>
Reviewed-by: tazjin <tazjin@tvl.su>
