code: function addModel (propertyName, model, cellDefinitions) {
    let cell = {
      model: propertyName
    }
    const modelType = getModelType(model)
    switch (modelType) {
      case 'array':
        if (model.items) {
          cell = arrayCell(propertyName, model, cellDefinitions)
        }
        break
  
      case 'object':
        cell = objectCell(propertyName, model, cellDefinitions)
        break
      case 'tuple':
        cell = tupleCell(propertyName, model, cellDefinitions)
    }
  
    return cell
  }
docs: Add a property to default layout
  @param {String} propertyName - the name of the property that holds this model
  @param {BunsenModel} model - the actual model
  @param {BunsenCell[]} cellDefinitions - the set of all cell definitions
  @returns {BunsenCell} - the new cell