Add a README.md section on how to setup the `import` rules in your project, depending on what bundler you're using.

We might need a section on how to setup the import rules in your project, depending on what bundler you're using:

node (I think works by default)
js (I think works by default)
webpack (requires config in your project)
pure TS (requires config in your project - or could be included in this package if we choose to, is another comment)
what about parcel/rollup/etc?

If the user doesn't do this, the project will report errors on all imports that are not node/node_modules.

mediamonks / frontend-coding-standards