Download the source code with
$ git clone https://github.com/PureGero/JustSkyblock.git
A folder will be created called JustSkyblock
with the source code inside
Setup an Eclipse workspace with
$ ./gradlew eclipse
Setup an IntelliJ workspace with
$ ./graldew idea
Compile the source into a jar with gradle:
$ ./gradlew jar
Or on widows:
> gradlew jar
The plugin jar will be found in build/libs
. Enjoy!