[React] Add Modal Popup Challenge

[rishabhm05]

Title and Issue number

Title : Modal Popup Challenge

Issue No. :

Code Stack : React JS

Close #

Checklist:

• [] I have mentioned the issue number in my Pull Request.
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md
• [] I have updated the Index.html file for my contribution

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[rishabhm05]

Modal Popup React JS Challenge is added.

[rishabhm05]

Updated the user detail and isNew tag