Update README.md

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Author: edizor

kotlin-math/README.md

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 ## Relevant Articles
 - [How to Check if a Number Is Part of the Fibonacci Series in Kotlin](https://www.baeldung.com/kotlin/fibonacci-number-test)
 - [Finding the Largest Among Three Numbers in Kotlin](https://www.baeldung.com/kotlin/max-numbers)
+- [Convert Octal Number to Decimal and Vice-Versa in Kotlin](https://www.baeldung.com/kotlin/octal-decimal-values-conversion)