talks: copying .gitattributes to all subrepositories
talks: copying .gitattributes to all subrepositories

Fixes #9281

Change-Id: I3d59b76b90c50553009a4f5add675c32ab24f828
Reviewed-on: https://go-review.googlesource.com/2077
Reviewed-by: Minux Ma <72d850dbd8858b791995463d8539b5a379577f28@golang.org>

Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks