[React] Add Traffic Light challenge

[rishabhm05]

Title and Issue number

Title : TrafficLightChallenge

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]

@arpansaha13 Hi i have done required changes 1 . Added key for each light item

2. Displayed duration for Active Light 3 . Added challenge below the other medium challenges

[arpansaha13]

Thank you for your contribution!

[arpansaha13]

I have noticed a bug right now. Check out this issue #325. Would you like to take it up @rishabhm05?

[rishabhm05]

yes @arpansaha13 Please assign it to me.

[arpansaha13]

I am not able to add you as an assignee. But you can open the PR for it anyway 👍

[rishabhm05]

okay sure