Product release: react-channel and adding Kotlin

This week HackerPen is undergoing major refactoring in using WebRTC and WebSockets. Additionally, HackerPen starts supporting Kotlin as a programming language.

refactor real-time connection

In the future, we are also aiming to make our real-time technology open-source, and this refactor makes a major step towards that.

support Kotlin

Hello Kotlin!

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