gistfile1.txt

modLoader="javafml" #mandatory
loaderVersion="[31,)" #mandatory This is typically bumped every Minecraft version by Forge. See our download page for lists of versions.
issueTrackerURL="http://my.issue.tracker/" #optional
[[mods]] #mandatory
modId="P4M11" #mandatory
version="1.15.2-1.0.0" #mandatory
displayName="P4xil Mod" #mandatory
updateJSONURL="http://myurl.me/" #optional
displayURL="http://example.com/" #optional
logoFile="P4xilMod.png" #optional
credits="By P4xil" #optional
authors="P4xil" #optional
description='''
This is a Mod That Adds Cool Things To Minecraft
'''

[[dependencies.P4xilMod]] #optional
    modId="forge" #mandatory
    mandatory=true #mandatory
    versionRange="[31,)" #mandatory
    ordering="NONE"
    side="BOTH"
[[dependencies.P4xilMod]]
    modId="minecraft"
    mandatory=true
    versionRange="[1.15.2]"
    ordering="NONE"
    side="BOTH"

My code

package P4xil;


import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


@Mod("P4M")
public class P4xilMod
{

    private static final Logger LOGGER = LogManager.getLogger();

    public P4xilMod() {

        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::doClientStuff);


        MinecraftForge.EVENT_BUS.register(this);
    }

    private void setup(final FMLCommonSetupEvent event) { }
    private void doClientStuff(final FMLClientSetupEvent event) {


    }

}