it is done

core/src/mindustry/mod/Mod.java

@@ -0,0 +1,27 @@
+package mindustry.mod;
+
+import arc.files.*;
+import arc.util.*;
+import mindustry.*;
+
+public class Mod{
+    /** @return the config file for this plugin, as the file 'mods/[plugin-name]/config.json'.*/
+    public Fi getConfig(){
+        return Vars.mods.getConfig(this);
+    }
+
+    /** Called after all plugins have been created and commands have been registered.*/
+    public void init(){
+
+    }
+
+    /** Register any commands to be used on the server side, e.g. from the console. */
+    public void registerServerCommands(CommandHandler handler){
+
+    }
+
+    /** Register any commands to be used on the client side, e.g. sent from an in-game player.. */
+    public void registerClientCommands(CommandHandler handler){
+
+    }
+}