refactor and add using constants instead of hard coded strings ...

Interfaces/Entities/IXStringSeeder.cs

@@ -0,0 +1,8 @@
+using xDataService.Interfaces;
+using xStringService.Models.Entities;
+
+namespace xStringService.Interfaces.Entities
+{
+    public interface IXStringSeeder : IXBaseDbSeeder<XString, int>
+    {}
+}