Cherry-pick to 7.11: Add placeholder readme to prevent build failure (#23256)#23263

Merged

dedemorton merged 1 commit intoelastic:7.11from dedemorton:backport/7.11/pr-23256

Dec 23, 2020

+6-166

Commits on Dec 23, 2020

Add placeholder readme to prevent build failure (elastic#23256 )
dedemorton
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