Add eslint

[IvanKiral]

Motivation

Which issue does this fix? Fixes #issue number

If no issue exists, what is the fix or new feature? Were there any reasons to fix/implement things that are not obvious?

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

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