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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def add_tile(self, tile_source, **kw):
        ''' Adds new ``TileRenderer`` into ``Plot.renderers``

        Args:
            tile_source (TileSource) : a tile source instance which contain tileset configuration

        Keyword Arguments:
            Additional keyword arguments are passed on as-is to the tile renderer

        Returns:
            TileRenderer : TileRenderer

        '''
        tile_renderer = TileRenderer(tile_source=tile_source, **kw)
        self.renderers.append(tile_renderer)
        return tile_renderer