Added configuration for linter and prettier to package.json
Added configuration for linter and prettier to package.json

This configuration also works with your favorite editor:

* Atom: Use linter-eslint package and active Fix on Save. Don't use prettier-atom, it won't help.
* VS Code: Use only ESLint extension and configure eslint.autoFixOnSave to true

Furthermore, the linter can be run using `npm run lint`, use `npm run lint-fix` for automatic fixing of the files.

qnipp/timeapp,qnipp/timeapp,qnipp/timeapp