feat: add Real-Time Counter Lab

freeCodeCamp / CurriculumExpansion

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Closed zairahira closed 1 month ago

zairahira commented 2 months ago

Checklist:

[x] I have read freeCodeCamp's contribution guidelines.
[x] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #454

zairahira commented 1 month ago

Sorry for adding a confusing title, the lab wasn't JS only. I have updated it.