Added documentation for Array.findIndex() method

[Prakhar29Sharma]

I've added documentation for Array.findIndex() method with proper chapter structure as mentioned in the CONTRIBUTORS.md. file created : 15_array-findindex.md

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Name	Status	Preview	Comments	Updated (UTC)
some-drops-of-javascript	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 6:32am

[roberto-butti]

Thank you for your PR. I think is a good chapter, well written and very clear. If you want, you can also add the example in the examples/ directory. Let me know if you want to add the example, otherwise, i can add it :)

Thank you

[Prakhar29Sharma]

Thanks for the feedback @roberto-butti. I'll do the changes and add the example

[roberto-butti]

Thank you, i will review it tomorrow early morning (Europe timezone).

[roberto-butti]

This is super @Prakhar29Sharma ! Thank you for your contribution, i also like the example when no elements match the criteria and also the additional notes are helpful.

[roberto-butti]

One thing is noticed @Prakhar29Sharma , is about the file name. You should name the file with the number 16 and not 15: 02-array/16_array-findindex.md Also the example should be 16 and not 15. Do you want to change? if you don't have time, or you don't want it , i can do it . Let me know :)

[Prakhar29Sharma]

Yes, I'll do it

[Prakhar29Sharma]

Hey @roberto-butti, I've changed the file name as requested. If there's anything else let me know.

[roberto-butti]

Hi @Prakhar29Sharma , thank you, I'm going to merge your helpful PR! Close #52