Folder and file structure

[leej11]

Describe the solution you'd like
There is no folder structure. Make one. For example one folder for "demos" i.e. put the jupyter notebooks here, and one folder for "code" i.e. the packaged up code.

Also, there are some files tracked that are kind of annoying... so I think it calls for adding them to a .gitignore (the pycache files for example). Just need to check this is okay to do and then do it.