创建分组接口完成

src/main/java/com/ruoyi/device/service/impl/GroupServiceImpl.java

@@ -67,7 +67,9 @@ public class GroupServiceImpl implements IGroupService
     @Override
     public Long createGroup(GroupDTO groupDTO)
     {
-        return null;
+        Group model = GroupServiceConvert.toModel(groupDTO);
+        groupDomain.insertGroup(model);
+        return model.getGroupId();
     }
 
     @Override