explain this: 

extends Node2D

const CELL_COUNT = 10

func _ready():
	for i in range(CELL_COUNT):
		var cell = Node2D.new()
		var rectangle = RectangleShape2D.new()
		var size = Vector2(randf_range(20, 100), randf_range(20, 100))
		rectangle.size = size
		var color_rect = ColorRect.new()
		color_rect.color = Color(randf(), randf(), randf())
		color_rect.size = size
		cell.add_child(rectangle)
		rectangle.add_child(color_rect)
		add_child(cell) Your answer should have exactly 4 paragraphs. Make sure that the first paragraph starts with the word "monitor" and that each paragraph is separated by two new lines.
user