Add a README to embed folder to explain why and what are inside of it
Add a README to embed folder to explain why and what are inside of it

Change-Id: I10b9db2a0f2bf641a630ddaf0a766b0bc44b1d51

GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit