Add the Ericsson GUS/2015 slide deck

The presentation made by Frank Stockmans in 2015
about the Ericsson migration to Gerrit was *very interesting*
and thus is worth to be shared for the people of the community
to review and learn from it.

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 *Frank Stockmans, Ericsson*
 ## 3:00 pm Gerrit at Yahoo, a 2-year Journey
 Sharing our experience in these 2 years on Gerrit's growth in Yahoo