Import and initialize ConfigurationManager class

The ConfigurationManager.java import directive and object declaration has been added to Main.java. Now, the ConfigurationManager class can be used to manage system-specific configuration details within the Main class.

src/main/java/org/gecko/wauh/Main.java

@@ -3,6 +3,7 @@
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.gecko.wauh.data.ConfigurationManager;
 import org.gecko.wauh.listeners.*;
 import org.gecko.wauh.commands.SetRadiusLimitCommand;
 import org.gecko.wauh.commands.StopWauh;
@@ -22,6 +23,7 @@ public final class Main extends JavaPlugin {
     private TNTListener tntListener;
     private CreeperListener creeperListener;
     private ScaleReverse scaleReverse;
+    private ConfigurationManager configurationManager;
 
     public int getRadiusLimit() {
         return playerRadiusLimit + 2;