Add link to Kronos Multiplatform Library

[softartdev]

Hi there,

I've recently developed a Kotlin Multiplatform library called Kronos-Multiplatform, which uses the Kronos library for iOS, alongside another library for Android. It provides network time synchronization capabilities for Kotlin Multiplatform projects.

Adding a reference in the README.md would be helpful for developers looking for a comprehensive solution for network time synchronization across multiple platforms.

Best regards, Artur