This example demonstrates how to create an additional app in a separate window to hold a GUI with parameters. Changing the GUI's parameters's values update the appearance of a circle in the main window.
In the code, pay attention to:
* ```ofCreateWindow``` to create additional windows
### Expected Behavior
* A circle displayed at the center of the main window changes in color, opacity and scale based on the parameters values of a GUI displayed in a separate window.
Instructions for use:
* drag the sliders of the parameters radius, r, g, b, a, to modify the appearance of the circle.
