Introduce front-end tasks

[nmalecki]

We should introduce some tasks to handle front-end code quality - for example - eslint.
In this issue, we can collect the ideas for what tasks we can implement into the tool.
Existing tasks in the GrumPHP https://github.com/phpro/grumphp/blob/master/doc/tasks.md - it means that we can easily implement them. If you have another idea - it's also good, this tool is easily extensibility so we can create and add our own task :)

[kwolny-creatuity]

We have some problems with code formatting on frontend. Usually because we use only code formatting provided by our IDE's (some of us use VS Code, some PHPStorm). We should implement a tool which will check our code before commiting and which will be independent of our IDE's.
I made some research and I think that good solution would be prettier used with git hooks (pre-commit git hook)
this is an article that I found:
https://deepinder.me/format-code-style-with-prettier-in-react-on-git-commit
I didn't tested it yet.