Hi, inside your sketch folder, create a folder called code and place the jar file there. No need to rename it. The processing IDE automatically creates this folder when you drop a jar file into the IDE.
Then, based on one of the files of the project the imports seem to be
import com.profesorfalken.jsensors.JSensors;
import com.profesorfalken.jsensors.model.components.Components;
You can maybe explore the other files in that repo to figure out how it is used.