add comments or a simple help on examples

[someparsa]

I know it is a to-do for this project to create a complete help for usage of functions and to explain how things work in the package, but for the alpha version testers; could you please add some pieces of notes and comments in the examples files or in a separate file to help them understand how files work and how they can use the package? I am working on the examples and notebooks provided and I can not understand why some errors appear. As for examples, files run healthy but no results are being plotted or displayed on the command window.