doc: contribute: adding supportive jpg image

Add the jpg image used in the documentation for
Project Roles.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2020-03-06 09:30:45 +01:00 committed by Anas Nashif
commit b0b10594ae

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