add support for Db Seeder, Fix GraphQL Generic Usage ...

Interfaces/IXBaseDbSeeder.cs

@@ -0,0 +1,25 @@
+using System.Threading.Tasks;
+using xDataService.Configuration;
+using xModels.Base;
+
+namespace xDataService.Interfaces
+{
+    /// <summary>
+    /// Db Seeder used to seed data on Database on startup time ...
+    /// </summary>
+    public interface IXBaseDbSeeder<TEntity, TKey>
+    where TEntity : XBaseEntity<TKey>
+    {
+        string Database { get; }
+
+        IXBaseRepository<TEntity, TKey> Repository { get; }
+        
+        XDataServiceConfiguration DataServiceConfiguration { get; }
+
+        /// <summary>
+        /// do all seeding action by helping of Repositories here ...
+        /// </summary>
+        /// <returns></returns>
+        Task Seed();
+    }
+}