create examples Kotlin Data classes features

[KonstantinKhan]

Description

Kotlin Data classes features

Related Issue

Closes #41

[e5LA]

Thanks for another contribution, @KonstantinKhan!

I like how this covers both the core features and the common pitfalls of data classes. Just a few small tweaks suggested, but overall, great work!

It’s our first Kotlin feature showcase, so we could also think about organizing the example to make it a bit easier to follow. For instance:

fun main() {
    demonstrateToString()
    demonstrateEquals()
    // ...

fun demonstrateToString() { /* focused example */ }
fun demonstrateEquals() { /* focused example */ }
fun demonstrateCopy() { /* focused example */ }
// etc.
}

What do you think?

[KonstantinKhan]

I think that it's a good idea.

[e5LA]

Thanks for addressing the feedback and making those improvements - the code is now even cleaner and more educational :)
Great contribution to the collection! 🎉 thanks @KonstantinKhan