i think this project could benefit from contribution guidelines

including but not limited to:

• non code contribution guides
  • already exists for translations and as issue templates
• IDE/dev-enviroment setup
  • recommended tools
  • how to setup debug and hotreload
  • which build tool / target to use
    • what do they do (the targets)
• which formatter should be used
  • could also be an action
• coding style
  • naming conventions, exception handling, file structure, etc
• pull request checklist
  • of cause changes should be tested, but maybe there are some non obvious things to look out for
  • apparently there are pull request templates like for issues, but they did not trigger for me?
• which Java version is used
  • what about potential upgrades (Java 8 is a decade old now)
• is Kotlin accepted in the codebase

this would take some of the guesswork out of the process, especially for people not familiar with Java and/or Minecraft server plugins. and some of it are just things that you would probably want to know regardless of familiarity