add prettier config file

[Sourabhh01]

Solved issue #5

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🔨 Latest commit	bbcda5a7482c6ca5d48d088e71642b245c2dfcf9

[gurpreet-legend]

@Sourabhh01, you successfully implemented prettier i assume, but i don't think you have formatted .js files using prettier scripts. Do run the scripts for each valid file as well.