First add the mod as a dependency in build.gradle.

dependencies {
  implementation "curse.maven:cavelib-1114316:5785724"
}

Next, I would recommend creating a class in which all biome properties will be.

Here create a init() method and register your biome

public class TestBiome {
  public static final ResourceKey<Biome> TEST = ResourceKey.create(Registries.BIOME, ResourceLocation.fromNamespaceAndPath(ExampleMod.MODID, "test"));
  public static void init(){
  }
}

and add it to the commonSetup method of the mod

public class ExampleMod{
  private void commonSetup(final FMLCommonSetupEvent event){
    TestBiome.init();
  }
}

don't forget that some settings will be in resources\data\yourmodid\worldgen\biome in a file with the name of your biome.

Here is example - test.json

More info about this file is available on the internet

It's all