Add promo ad for Jakarta EE dev survey 2020

Signed-off-by: Eric Poirier <eric.poirier@eclipse-foundation.org>
diff --git a/promo/images/jakarta-ee-dev-survey-2020.png b/promo/images/jakarta-ee-dev-survey-2020.png
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+++ b/promo/images/jakarta-ee-dev-survey-2020.png
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