These are simple 0data apps that demonstrate CRUD operations for /todos only using HTML, CSS, and JavaScript (minimal dependencies, no build systems). Please consult the README for any protocol to learn more:
If you want to modify the code, you'll also need to serve the application in a url. You could just open the index.html file in a browser, but unfortunately that will not work because the authentication flow performs a redirect and that won't work with a website being served with the file:// protocol.
Any tool to run a local server will work, for example you could use ViteJS:
npm install -g vite
vite .