NOTE: ToC generated using https://github.com/fenryka/TOC-Generator
As with most of m projects, don't use this! this was done as an exerise to get me back into Kotlin after a fair chunk of time working on C++. It almost certainly isn't useful to anyone except me.
Get gradle somehow, it's a thing that the java crowd seem to know how to do, IntelliJ did some magic, and it appeared for me.
./gradlew build
java -jar build/libs/Connect4-1.0-SNAPSHOT.jar