Add a fyne GUI

[Anirban166]

In order to make a project seem more like an application software, adding a graphical user interface (GUI) is always a good idea. Same goes for this project. In order to make the process much more simpler, a cross platform GUI by the name of fyne exists, which you should get familiar with for this project. (alternatives are accepted)

Your goal is to add a simple fyne GUI which accepts the number of world lines as input, and subsequently displays the slices for the world lines and the divergence (%) as output.