Add Maven and Amper configurations in the documentation

[koperagen]

Coroutines have configuration for Maven
https://github.com/Kotlin/kotlinx.coroutines

As i said here, for Maven we don't have a plugin now and we can mention it
#717 (reply in thread)

But for Amper it should be possible to use Gradle plugin too
Gradle interop, including combining Amper and Gradle modules in one project*.