React: Styling React Applications - examples for css modules

[yd2960]

Because

Currently, the article explains CSS modules as an approach to style React applications. However, it does not immediately provide an example for CSS modules. Users would have to go scroll down to the assignment section for detailed documentations.

This PR

Added a brief example to illustrate how CSS modules work.

Issue

N/A

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum 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

[wise-king-sullyman]

Thank you for taking the time to make this PR!

However I don't think an immediate example is a great fit for the lesson since I don't think there should be much time between the readers seeing the example, and reading the assignment which provides a much fuller context. So I will be closing this PR.

That being said, thank you again for trying to improve our curriculum!