Add tests

[TGRHavoc]

At the moment there's no tests. I'm just opening up the webpage on a local server and clicking around.

It would be nice to have tests to test the various modules and the interaction they have with the DOM.

Jest has a VDOM that we can use for the DOM interaction testing.

[TGRHavoc]

I think utilizing something like jest-fuzz would also be nice to see if random stuff breaks.

Would be nice to test more than just ASCII strings though

[TGRHavoc]

Woop.
This repo now uses Github actions to automate the testing and deployment (hopefully).

The current workflow is as follows:

• Create a branch for a new feature/fix etc
• Send a PR to develop branch
• Tests will run
• If the tests complete, merge into develop branch
• When enough merges are done to develop, merge it into master
• This merge should automatically bundle and deploy the code to github-release

Hopefully tests will make everything run a bit smoother in terms of releasing new features etc