Lots of additions and restructuring

TOOHUCardAPI/Data/Seeders/CardSeeder.cs

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+using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using TOOHUCardAPI.Data.Models;
+
+namespace TOOHUCardAPI.Data.Seeders
+{
+    public class CardSeeder : ISeeder
+    {
+        public ModelBuilder SeedData(ModelBuilder builder)
+        {
+            var dataFile = System.IO.File.ReadAllText(ISeeder.SeedDataDirectory + @"CardData.json");
+            JObject jsonifiedData = JObject.Parse(dataFile);
+            var cardObjects = jsonifiedData.Properties().Select(i =>
+            {
+                var obj = i.Value.ToObject<JObject>();
+                obj["ItemCode"] = i.Name;
+                return obj;
+            }).Select(obj => obj.ToObject<Card>());
+            builder.Entity<Card>().HasData(cardObjects);
+            return builder;
+        }
+    }
+}

TOOHUCardAPI/Data/Seeders/ISeeder.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace TOOHUCardAPI.Data.Seeders
+{
+    public interface ISeeder
+    {
+        public static string SeedDataDirectory = @"Data/SeedData/";
+        public ModelBuilder SeedData(ModelBuilder builder);
+    }
+}