Fix permissions issue

build.gradle

@@ -3,7 +3,7 @@ plugins {
 }
 
 group = 'xyz.lncvrt'
-version = '1.0.0'
+version = '1.0.1'
 
 repositories {
     mavenCentral()

src/main/java/xyz/lncvrt/setmaxplayers/SetMaxPlayers.java

@@ -1,10 +1,15 @@
 package xyz.lncvrt.setmaxplayers;
 
+import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public final class SetMaxPlayers extends JavaPlugin {
+    public FileConfiguration config;
+
     @Override
     public void onEnable() {
+        saveDefaultConfig();
+        config = getConfig();
         getCommand("setmaxplayers").setExecutor(new SetMaxPlayersCommand(this));
     }
 }

src/main/java/xyz/lncvrt/setmaxplayers/SetMaxPlayersCommand.java

@@ -23,6 +23,10 @@ public class SetMaxPlayersCommand implements CommandExecutor {
 
     @Override
     public boolean onCommand(CommandSender commandSender, Command command, String s, String[] strings) {
+        if (!commandSender.hasPermission(plugin.config.getString("permission", "lncvrt.setmaxplayers.use"))) {
+            commandSender.sendMessage(ChatColor.RED + "You don't have permission!");
+            return true;
+        }
         if (strings.length != 1) {
             commandSender.sendMessage(ChatColor.RED + "Correct usage: /setmaxplayers <amount>");
             return true;

src/main/resources/config.yml

@@ -0,0 +1 @@
+permission: 'lncvrt.setmaxplayers.use'