dev_doc: Add developer documentation for safety plugins.
Issue-Ref: 3431 Issue-Url: https://af3-developer.fortiss.org/issues/3431 Signed-off-by: Alexander Diewald diewald@fortiss.org
Issue-Ref: 3431 Issue-Url: https://af3-developer.fortiss.org/issues/3431 Signed-off-by: Alexander Diewald diewald@fortiss.org