Added Test Runner details for Kotlin in Japanese Language (#2165)

[deploy site]

* Added Test Runner details for Kotlin

* Added Test Runner details for Kotlin in Japanese Language

Author: automatealchemist

Diff for: website_and_docs/content/documentation/webdriver/getting_started/using_selenium.en.md

@@ -98,7 +98,10 @@ that will be used for all examples on this page.
 
 {{% tab header="Kotlin" %}}
 
+- [Kotest](https://kotest.io/) - A flexible and comprehensive testing framework specifically designed for Kotlin.
+- [JUnit5](https://junit.org/junit5/) - The standard Java testing framework, fully compatible with Kotlin.
 {{% /tab %}}
+
 {{< /tabpane >}}
 
 ### Installing

Diff for: website_and_docs/content/documentation/webdriver/getting_started/using_selenium.ja.md

@@ -88,7 +88,10 @@ Seleniumコードの使用方法に関係なく、優れた統合開発環境が
 
 {{% tab header="Kotlin" %}}
 
+- [Kotest](https://kotest.io/) - Kotlin専用に設計された、柔軟で包括的なテストフレームワークです。
+- [JUnit5](https://junit.org/junit5/) - 標準的なJavaテストフレームワークであり、Kotlinと完全に互換性があります。
 {{% /tab %}}
+
 {{< /tabpane >}}
 
 ### 装着