Research: set up CI and a Test directory

[masonmcelvain]

It would be cool if we set up continuous integration so that a test suite is run against every commit to this repo. Github has some starter docs:
https://docs.github.com/en/actions/guides/setting-up-continuous-integration-using-workflow-templates

What to do

• Figure out how we want to set up CI, and document it here.
• Brainstorm some ways we can test our code/ setup a script to run the tests.

We want CI so we can make it easy to add tests to our code as we develop.

[kgoo124]

@masonmcelvain if we use a testing framework like Jest, we can easily run the testing script for every pull request