Added all the base code for managing world-scope groups.

FFXIVClassic World Server/DataObjects/Group/Group.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FFXIVClassic_World_Server.DataObjects.Group
+{
+    class Group
+    {
+        public readonly ulong groupIndex;
+
+        public Group(ulong groupIndex)
+        {
+            this.groupIndex = groupIndex;
+        }
+    }
+}