Method label

Adds a label to the plot, with an optional marker. # Arguments `text` - Text of the label `x` - X coordinate of the label `y` - Y coordinate of the label `options` - Array of LabelOption<&str> controlling the appearance of the label. Relevant options are: `Offset` - Specifies the offset of the label `Font` - Specifies the font of the label `TextColor` - Specifies the color of the label `Rotate` -

(
		&'l mut self, text: &str, x: Coordinate, y: Coordinate, options: &[LabelOption<&str>],
	)