Implement Merge Sort Algorithm in JavaScript

[Claribell]

This issue is about Merge Sort Algorithm

• ✅ I searched or browsed the repo’s other issues to ensure this is not a duplicate

• ✅ Issue Title is Merge Sort Algorithm in JavaScript

• ✅ I will send my PR only after I'm assigned to this issue by any maintainer

• ✅ Assign this issue to me

• ✅ I ensure that I am not already assigned to 2 or more issues

[sobhanbera]

Hey @Claribell,
I've already assigned a issue to you. Do work on that first!

[VaishnaviMudaliar]

hey , can this issue be assigned to me?

[mreshank]

@sobhanbera can you please assign this issue to me? I'm really interested.

[Jatingupta9120]

Assign this issue to me