class in Kotlin

Classes are declared by using the class keyword followed by an identifier.
* Kotlin class does not have class-level access modifier. 
* The name of the class follows the class keyword. The name of the class must be a valid identifier. 
* The remainder is the class body, where the class members are defined, including fields, and methods.
```
//[class] - [identifier]
class Main {
    // Fields and methods go here...
}

fun main() {
    var m = Main();   
    println(m);
}
```