Add object literal constructor docs to Rectangle.

src/basic/Rectangle.js

@@ -28,6 +28,25 @@ var Rectangle = this.Rectangle = Base.extend(/** @lends Rectangle# */{
 	 * @param {Point} point the top-left point of the rectangle
 	 * @param {Size} size the size of the rectangle
 	 */
+	/**
+	 * Creates a Rectangle object.
+	 *
+	 * @name Rectangle#initialize
+	 * @param {Object} properties An object literal containing properties to be
+	 * set on the rectangle.
+	 * 
+	 * @example // Create a rectangle between {x: 20, y: 20} and {x: 80, y:80}
+	 * var rectangle = new Rectangle({
+	 * 	point: [20, 20],
+	 * 	size: [60, 60]
+	 * });
+	 * 
+	 * @example // Create a rectangle between {x: 20, y: 20} and {x: 80, y:80}
+	 * var rectangle = new Rectangle({
+	 * 	from: [20, 20],
+	 * 	to: [80, 80]
+	 * });
+	 */
 	/**
 	 * Creates a rectangle object.
 	 *