The plugin shares a common service layer with: https://github.com/MicroFocus/octane-eclipse-plugin
Common: https://github.com/MicroFocus/octane-plugin-common
Connection to the server is done using the REST SDK for Core Software Delivery Platform, see:
The plugin is build using gradle, with the https://github.com/JetBrains/gradle-intellij-plugin
Go to the project main folder and run:
gradle buildPlugin
gradle runIdea
You can run this gradle task from IntelliJ in debug mode.