Add Cypress e2e tests

[Kamahl19]

https://www.cypress.io/ https://github.com/testing-library/cypress-testing-library https://github.com/laststance/react-typescript-todo-example-2020

https://www.youtube.com/watch?v=LcGHiFnBh3Y https://relatablecode.com/testing-a-react-application-setting-up-cypress https://relatablecode.com/testing-a-react-application-creating-a-cypress-test https://relatablecode.com/testing-a-reaction-application-updating-to-cypress-version-10