[example] Added shapes_hilbert_curve

[hmz-rhl]

[hmz-rhl]

Hi Ray,
Can you see what's wrong with windows build

Thx

[raysan5]

@hmz-rhl Please, could you change example name to shapes_hilbert_curve? Also, all raylib examples are 800x450 and should include a screenshot (can bee captured with F12 while example runs).

Example should follow template structure, with Update and Draw organized like template. Also, function declaration and definition should be separated like in this example.

[hmz-rhl]

I did my best, hope is enough, don't hesitate to ping me for more mods ;)

[raysan5]

@hmz-rhl thanks for the addition!