React: Complete README

[scorpi4n]

Because

The README in the react folder was mostly blank (only had "wip") whereas the other folders had complete READMEs.

This PR

• Completes the react folder's README in the same way the other folders' READMEs are

Issue

The contributing guide said small changes can have a PR submitted without opening an issue

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[ManonLef]

Thank you for doing this! I do wish to discuss this with @TheOdinProject/maintainers

With the ever changing content, I wonder if these are a good idea to keep around in their current form to be honest. A bunch of new lessons were added recently and I'm sure the README's haven't been updated.

Perhaps we can consider a better format for the README's which doesn't include the path layout and is less coupled. Instead we could consider a contributing guide, a contact method for professionals or content creators or something like that? I would love to hear opinions.

[scorpi4n]

I was kind of wondering the same while I put it together. I was doing the 'Using Git In The Real World' lesson and found the blank README, so I figured I might as well create a PR.

I do think it'd be a good idea to either entirely rewrite or just remove the README's. All of them have a disclaimer saying that they might be out of sync with the actual courses, and the README I put together hadn't been touched in about a year.

[thatblindgeye]

I feel like we could get away with just removing them. I can't think of anything that should live in individual directory README's that isn't better suited to the top level README/contribution guide, other than possibly a basic overview of what the course is/should ideally cover (though is that really necessary?).

[01zulfi]

The current layout of course README's was part of the folder structure project I was working on last year. See TheOdinProject/top-meta#109

+1 on removing the course READMEs. They are out -of-date and provide little to no value.

[scorpi4n]

Removing the READMEs is simple enough, I can do that if that's how we want to move forward.

[01zulfi]

@scorpi4n Yes, please make a PR if you can

[scorpi4n]

Alright! I'll close those this one and work make a new PR