[Feature] Reorganize the file structure of the repository

[samgdotson]

This issue may be closed when there is a PR that does the following things:

• Adds a LICENSE file (tells people what they're allowed to do with the repository)
• Adds a .gitignore file (prevents accidentally tracking "cruft").
• Adds a environment.yml file (to make the work contained herein reproducible).
• Adds a new directory called notebooks
• Moves all .ipynb files to the new directory with the command git mv *.ipynb notebooks (to preserve file history)

To the README.md file:

• Adds a description of the repository (what work is being done, here?)
• Correctly spells osier (lowercase)
• Adds instructions to run the code in the repository (how do I install all the necessary packages?)