Add support of OpenJDK

[IRus]

I'm curious is this project planning to provide library to use in standard Java/Kotlin (Without Android)

[lambdapioneer]

Hi @IRus, thanks for the suggestion :) We currently do not plan to add support for builds outside Android/iOS.

However, we are open for pull-requests that add build support for other platforms. After all, that's one of the big benefits of having a modern C++ core :). I'll mark this issue accordingly.