Beginning work on grouped servers

core/src/mindustry/net/ServerGroup.java

@@ -1,6 +1,14 @@
 package mindustry.net;
 
 public class ServerGroup{
-    public String[] addresses;
     public String name;
+    public String[] addresses;
+
+    public ServerGroup(String name, String[] addresses){
+        this.name = name;
+        this.addresses = addresses;
+    }
+
+    public ServerGroup(){
+    }
 }