feat-Added Default color

[DivyaVijay1234]

Description

A default colour has been added to the figure drawn

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How has this change been tested, please provide a testcase or example of how you tested the change?

scene = draw_line(scene, start=start_point, end=end_point) # Uses default color The draw_line function is called in the above manner without the user specifying a color. The default color is used to display the line. The other draw functions can be called similarly