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Add shim/README.md to explain what the shim/ tree is for (#6860)

It's not obvious why this tree is here. Add a README explaining it.
D
Dave Bort committed
d9d485929622066cd295ebe5f950d5d4dc12fb9d
Parent: fd2c323
Committed by GitHub <noreply@github.com> on 11/14/2024, 9:37:33 PM