Changed domains, configured links between VisaApplication and Applicant,created generic repository and repositories for domains

SchengenVisaApi/Domains/ApplicantDomain/PlaceOfWork.cs

@@ -1,6 +1,4 @@
-using Domains.Common;
-
-namespace Domains.ApplicantDomain
+namespace Domains.ApplicantDomain
 {
     public class PlaceOfWork : IEntity
     {
@@ -10,7 +8,7 @@ namespace Domains.ApplicantDomain
         /// Name of hirer
         public string Name { get; set; } = null!;
 
-        /// <see cref="Domains.Common.Address"/> of hirer
+        /// <see cref="ApplicantDomain.Address"/> of hirer
         public Address Address { get; set; } = null!;
 
         /// Phone number of hirer