Create module

[beaudrychase]

Cool project!

I was planning on using it to generate my own planner for my SuperNote. I made some QoL improvements to the code and thought you might want some of these upstream. I'm just throwing this out there, happy to keep these changes only on my fork.

Details

• Added type annotations to methods
• split class definitions into their own files
• restructured the classes a bit so that attributes that are used are defined in the constructor.
• Added requirements.txt for dependencies.
• The project is run as a module

[beaudrychase]

I'm not sure where all of the diffs came from here.