Revert "[DataStore] Add README.md"

Revert submission 26560594-cherrypicker-L21300030002461779:N81800030040573477

Reason for revert: Build breakages in b/329500917. 

Reverted changes: /q/submissionid:26560594-cherrypicker-L21300030002461779:N81800030040573477

Change-Id: I5a4985401a32652017ef70183579310f03999bd7
1 file changed