docs: def add_layer(self, obj=None):
          """This function adds another empty layer (Layer) to the layers
          list and optionally merges a given object into this layer
  
          :param obj: An object to be merged with this layer
          :type obj: object
          """
          new_layer = Layer()
          if obj:
              new_layer.merge(obj)
          self.layers.append(new_layer)