[Add] MasterData Services.

AMREZ.EOP.Domain/Entities/MasterData/District.cs

@@ -0,0 +1,13 @@
+namespace AMREZ.EOP.Domain.Entities.MasterData;
+
+public class District : MasterBase
+{
+    public string Code { get; set; } = null!;
+    public Guid ProvinceId { get; set; }
+    public Province Province { get; set; } = null!;
+    public ICollection<Subdistrict> Subdistricts { get; set; } = new List<Subdistrict>();
+}
+
+public class DistrictBlock : MasterBlockBase
+{
+}