Add React Testing Library Course

[Queen-esther01]

What does this PR do?

Add resource(s) | Remove resource(s) | Add info | Improve repo
Added resource

For resources

Description

I added a beginner react testing library course

Why is this valuable (or not)?

This gives react beginners a good start in unit and integration tests using react testing library. The course is very easy to follow.

How do we know it's really free?

It is available on Youtube

For book lists, is it a book? For course lists, is it a course? etc.

It is a course

Checklist:

• Read our contributing guidelines.
• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions]

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