Create ADOPTERS.md (#434)
Create ADOPTERS.md (#434)

* Add ADOPTERS.md

Signed-off-by: Richard Hartmann <dbc5c9b9cbc722d5250b7cedc577ded204477545@richih.org>

* Add GitLab

Signed-off-by: Richard Hartmann <dbc5c9b9cbc722d5250b7cedc577ded204477545@richih.org>
grafana/tanka