Added a new Maths algorithm to determine if two non-null integers are "friendly numbers"#1267

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raklaptudirm merged 3 commits intoTheAlgorithms:masterfrom

fun-guava:friendly_numbers

Nov 30, 2022

Commits on Nov 27, 2022

Added FriendlyNumbers.js, to determine if two integers are friendly numbers
fun-guava
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Fixed a typo in the error message
fun-guava
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Following the advice of appgurueu, outsourced abundancyIndex ot its own function
fun-guava
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