Make Variables notebook

[OmegaLambda1998]

@wtgee
So I was thinking of two options for this.
Either have all the basics (variable, lists, functions, types, etc...) in one mega notebook
Or split them up into different notebooks (variable.ipynb, lists.ipynb, functions.ipynb, etc...)

I think that a single notebook is okay for now and we will just evaluate that as it grows bigger.

Just paraphrasing what was discussed in the hack week:
We've decided to split it into a number of different notebooks.
These will include basic python ala Carpentries, as well as more specific packages like numpy, matplotlib, pandas, and astropy.

I'll make issues for each of these

Originally posted by @MrPop2213 in #11 (comment)

[OmegaLambda1998]

@MrPop2213 I'm starting on this

[OmegaLambda1998]

This has been created