Added main methods.

.gitlab-ci.yml

+before_script:
+  - mvn clean
+
+stages:
+  - build
+
+Flags:
+  stage: build
+  script:
+    - mvn package
+  only:
+    - master
+  tags:
+    - maven
\ No newline at end of file

src/main/java/nl/zandorsmith/afkkick/AFKKick.java

 package nl.zandorsmith.afkkick;
 
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import java.util.HashMap;
+
 /**
  * Main class.
  *
@@ -9,4 +13,34 @@ import org.bukkit.plugin.java.JavaPlugin;
  * @since 1.0
  */
 public class AFKKick extends JavaPlugin {
+
+    HashMap<String, Integer> times = new HashMap<String, Integer>();
+
+    int time = 300;
+    String message = "Kicked because you were afk for too long.";
+
+    @Override
+    public void onEnable() {
+        saveDefaultConfig();
+        getConfig().options().copyDefaults(true);
+
+        time = getConfig().getInt("time");
+        message = getConfig().getString("message");
+
+        Bukkit.getScheduler().runTaskTimer(this, new Runnable() {
+            @Override
+            public void run() {
+                for(Player player : Bukkit.getOnlinePlayers()) {
+                    if(times.get(player.getName()) == null)
+                        times.put(player.getName(), 0);
+                    else
+                        times.put(player.getName(), times.get(player.getName()) + 1);
+
+                    if(times.get(player.getName()) >= time)
+                        player.kickPlayer(message);
+                }
+            }
+        }, 20l, 20l);
+    }
+
 }

src/main/resources/config.yml

+time: 300
+message: 'Kicked because you were afk for too long.'
\ No newline at end of file