refactoring backend structure

Sledgemapper.Api/Core/Entities/CampaignAggregate/Campaign.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using Sledgemapper.Entities;
+
+namespace Sledgemapper.Api.Core.Entities.CampaignAggregate
+{
+    public class Campaign
+    {
+        [Key]
+        public int CampaignId { get; set; }
+
+        [Required]
+        public string CampaignName { get; set; }
+
+        [Required]
+        public int OwnerUserId { get; set; }
+
+        public List<User> InvitedUsers { get; set; }
+    }
+}

Sledgemapper.Api/Core/Entities/CampaignAggregate/Map.cs

@@ -0,0 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Sledgemapper.Api.Core.Entities.CampaignAggregate
+{
+    public class Map
+    {
+        [Key]
+        public int MapId { get; set; }
+
+        [Required]
+        public string MapName { get; set; }
+
+        [Required]
+        public int CampaignId { get; set; }
+
+    }
+}