Plugin Not Working?

Okay, so i made this plugin (as a first plugin/test) and i followed this tutorial (https://youtu.be/XaU8JKQW0Ao)



i did everything but its not working, nor is the '/hello' thing showing..

Here is the Main java:

package me.Test.Spawn;
import org.bukkit.plugin.java.JavaPlugin;
import me.Test.Spawn.commands.xd;

public class Main extends JavaPlugin{

@Override
public void onEnable() {
//Plugin Starts
new xd(this);
}
}



command:


package me.Test.Spawn.commands;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import me.Test.Spawn.Main;

public class xd implements CommandExecutor{
private Main plugin;

public xd(Main plugin2) {
this.plugin = plugin2;
plugin.getCommand("hello").setExecutor(this);
}

@Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
if (!(sender instanceof Player)) {
sender.sendMessage("Players are the only ones who can run this command!");
return true;
}

Player plr = (Player) sender;
plr.sendMessage("Helloooo");

return false;
}
}

Thanks!