Docs link (java souce code is still not documented)
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If you just want to use the unity Project, then just open the Unity_BT_lib folder in your Unity Editor!.
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If you need to change the java code, then read the following:
The repository contains two folders, one an AndroidStudio project and the other is a Unity Project. In the AndroidStudio project you need to run the task doRelease/doDebug from gradle. It will compile and move the required files to the Unity project.
On Windows: gradlew doRelease
On Mac or Linux: ./gradlew doRelease
Read: https://developer.android.com/studio/build/building-cmdline
IOUtils file and the new gradle build method (previously python!) was first added by Jerome Lacoste.