Create wiki page for creating a popup menu

[YotamAshman]

Create a page teaching how to create a popup menu using the logic implemented in #59 .

[YotamAshman]

Can reference https://github.com/YotamAshman/Graphos/wiki/How-to-use-the-pseudo-code-visualizer

[YotamAshman]

This needs to wait for the right-click menu logic to be refactored into Callables: #77
As this change might change the way the menu is created.